diff --git a/csharp/ql/lib/ext/generated/Microsoft.Android.Build.Ndk.model.yml b/csharp/ql/lib/ext/generated/Microsoft.Android.Build.Ndk.model.yml
index cb90eb148004b..d5ea2c5d4b2d0 100644
--- a/csharp/ql/lib/ext/generated/Microsoft.Android.Build.Ndk.model.yml
+++ b/csharp/ql/lib/ext/generated/Microsoft.Android.Build.Ndk.model.yml
@@ -13,6 +13,11 @@ extensions:
       - ["Microsoft.Android.Build.Ndk", "NdkTools", False, "get_ToolPrefixPath", "()", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
       - ["Microsoft.Android.Build.Ndk", "NdkVersion", False, "NdkVersion", "(System.String)", "", "Argument[0]", "Argument[this]", "taint", "df-generated"]
       - ["Microsoft.Android.Build.Ndk", "NdkVersion", False, "ToString", "()", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
+  - addsTo:
+      pack: codeql/csharp-all
+      extensible: sourceModel
+    data:
+      - ["Microsoft.Android.Build.Ndk", "Ndk", False, "get_NdkPath", "()", "", "ReturnValue", "environment", "df-generated"]
   - addsTo:
       pack: codeql/csharp-all
       extensible: neutralModel
diff --git a/csharp/ql/lib/ext/generated/Microsoft.Extensions.Configuration.UserSecrets.model.yml b/csharp/ql/lib/ext/generated/Microsoft.Extensions.Configuration.UserSecrets.model.yml
index d70c162a457e2..9394ce3e18084 100644
--- a/csharp/ql/lib/ext/generated/Microsoft.Extensions.Configuration.UserSecrets.model.yml
+++ b/csharp/ql/lib/ext/generated/Microsoft.Extensions.Configuration.UserSecrets.model.yml
@@ -5,6 +5,11 @@ extensions:
       extensible: summaryModel
     data:
       - ["Microsoft.Extensions.Configuration.UserSecrets", "PathHelper", False, "GetSecretsPathFromSecretsId", "(System.String)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
+  - addsTo:
+      pack: codeql/csharp-all
+      extensible: sourceModel
+    data:
+      - ["Microsoft.Extensions.Configuration.UserSecrets", "PathHelper", False, "GetSecretsPathFromSecretsId", "(System.String)", "", "ReturnValue", "environment", "df-generated"]
   - addsTo:
       pack: codeql/csharp-all
       extensible: neutralModel
diff --git a/csharp/ql/lib/ext/generated/Microsoft.Extensions.DependencyModel.Resolution.model.yml b/csharp/ql/lib/ext/generated/Microsoft.Extensions.DependencyModel.Resolution.model.yml
index c24810fb15859..f3bfe2eb2d22b 100644
--- a/csharp/ql/lib/ext/generated/Microsoft.Extensions.DependencyModel.Resolution.model.yml
+++ b/csharp/ql/lib/ext/generated/Microsoft.Extensions.DependencyModel.Resolution.model.yml
@@ -7,6 +7,11 @@ extensions:
       - ["Microsoft.Extensions.DependencyModel.Resolution", "CompositeCompilationAssemblyResolver", False, "CompositeCompilationAssemblyResolver", "(Microsoft.Extensions.DependencyModel.Resolution.ICompilationAssemblyResolver[])", "", "Argument[0].Element", "Argument[this]", "taint", "df-generated"]
       - ["Microsoft.Extensions.DependencyModel.Resolution", "ICompilationAssemblyResolver", True, "TryResolveAssemblyPaths", "(Microsoft.Extensions.DependencyModel.CompilationLibrary,System.Collections.Generic.List<System.String>)", "", "Argument[0]", "Argument[1].Element", "taint", "df-generated"]
       - ["Microsoft.Extensions.DependencyModel.Resolution", "ICompilationAssemblyResolver", True, "TryResolveAssemblyPaths", "(Microsoft.Extensions.DependencyModel.CompilationLibrary,System.Collections.Generic.List<System.String>)", "", "Argument[this]", "Argument[1].Element", "taint", "df-generated"]
+  - addsTo:
+      pack: codeql/csharp-all
+      extensible: sourceModel
+    data:
+      - ["Microsoft.Extensions.DependencyModel.Resolution", "DotNetReferenceAssembliesPathResolver", False, "Resolve", "()", "", "ReturnValue", "environment", "df-generated"]
   - addsTo:
       pack: codeql/csharp-all
       extensible: neutralModel
diff --git a/csharp/ql/lib/ext/generated/System.Collections.Generic.model.yml b/csharp/ql/lib/ext/generated/System.Collections.Generic.model.yml
index 42a1de85d0085..72e28a0029d35 100644
--- a/csharp/ql/lib/ext/generated/System.Collections.Generic.model.yml
+++ b/csharp/ql/lib/ext/generated/System.Collections.Generic.model.yml
@@ -13,6 +13,10 @@ extensions:
       - ["System.Collections.Generic", "CollectionExtensions", False, "GetRuntimeAssets", "(System.Collections.Generic.IEnumerable<Microsoft.Extensions.DependencyModel.RuntimeAssetGroup>,System.String)", "", "Argument[0].Element", "ReturnValue", "taint", "df-generated"]
       - ["System.Collections.Generic", "CollectionExtensions", False, "GetRuntimeFileAssets", "(System.Collections.Generic.IEnumerable<Microsoft.Extensions.DependencyModel.RuntimeAssetGroup>,System.String)", "", "Argument[0].Element", "ReturnValue", "taint", "df-generated"]
       - ["System.Collections.Generic", "CollectionExtensions", False, "GetRuntimeGroup", "(System.Collections.Generic.IEnumerable<Microsoft.Extensions.DependencyModel.RuntimeAssetGroup>,System.String)", "", "Argument[0].Element", "ReturnValue", "taint", "df-generated"]
+      - ["System.Collections.Generic", "CollectionExtensions", False, "GetValueOrDefault<TKey,TValue>", "(System.Collections.Generic.IReadOnlyDictionary<TKey,TValue>,TKey)", "", "Argument[0].Element", "ReturnValue", "taint", "df-generated"]
+      - ["System.Collections.Generic", "CollectionExtensions", False, "GetValueOrDefault<TKey,TValue>", "(System.Collections.Generic.IReadOnlyDictionary<TKey,TValue>,TKey)", "", "Argument[1]", "ReturnValue", "taint", "df-generated"]
+      - ["System.Collections.Generic", "CollectionExtensions", False, "GetValueOrDefault<TKey,TValue>", "(System.Collections.Generic.IReadOnlyDictionary<TKey,TValue>,TKey,TValue)", "", "Argument[0].Element", "ReturnValue", "taint", "df-generated"]
+      - ["System.Collections.Generic", "CollectionExtensions", False, "GetValueOrDefault<TKey,TValue>", "(System.Collections.Generic.IReadOnlyDictionary<TKey,TValue>,TKey,TValue)", "", "Argument[1]", "ReturnValue", "taint", "df-generated"]
       - ["System.Collections.Generic", "CollectionExtensions", False, "GetValueOrDefault<TKey,TValue>", "(System.Collections.Generic.IReadOnlyDictionary<TKey,TValue>,TKey,TValue)", "", "Argument[2]", "ReturnValue", "taint", "df-generated"]
       - ["System.Collections.Generic", "CollectionExtensions", False, "Remove<TKey,TValue>", "(System.Collections.Generic.IDictionary<TKey,TValue>,TKey,TValue)", "", "Argument[0].Element", "ReturnValue", "taint", "df-generated"]
       - ["System.Collections.Generic", "CollectionExtensions", False, "TryAdd<TKey,TValue>", "(System.Collections.Generic.IDictionary<TKey,TValue>,TKey,TValue)", "", "Argument[0].Element", "Argument[2]", "taint", "df-generated"]
@@ -139,7 +143,6 @@ extensions:
       - ["System.Collections.Generic", "ByteEqualityComparer", "GetHashCode", "()", "summary", "df-generated"]
       - ["System.Collections.Generic", "ByteEqualityComparer", "GetHashCode", "(System.Byte)", "summary", "df-generated"]
       - ["System.Collections.Generic", "CollectionExtensions", "AddRange<T>", "(System.Collections.Generic.List<T>,System.ReadOnlySpan<T>)", "summary", "df-generated"]
-      - ["System.Collections.Generic", "CollectionExtensions", "GetValueOrDefault<TKey,TValue>", "(System.Collections.Generic.IReadOnlyDictionary<TKey,TValue>,TKey)", "summary", "df-generated"]
       - ["System.Collections.Generic", "CollectionExtensions", "InsertRange<T>", "(System.Collections.Generic.List<T>,System.Int32,System.ReadOnlySpan<T>)", "summary", "df-generated"]
       - ["System.Collections.Generic", "Comparer<T>", "Compare", "(System.Object,System.Object)", "summary", "df-generated"]
       - ["System.Collections.Generic", "Comparer<T>", "Compare", "(T,T)", "summary", "df-generated"]
diff --git a/csharp/ql/lib/ext/generated/System.Configuration.model.yml b/csharp/ql/lib/ext/generated/System.Configuration.model.yml
index 609add7d83be9..0d87d2b9f9eb5 100644
--- a/csharp/ql/lib/ext/generated/System.Configuration.model.yml
+++ b/csharp/ql/lib/ext/generated/System.Configuration.model.yml
@@ -194,6 +194,12 @@ extensions:
       - ["System.Configuration", "UriSection", False, "get_Idn", "()", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
       - ["System.Configuration", "UriSection", False, "get_IriParsing", "()", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
       - ["System.Configuration", "UriSection", False, "get_SchemeSettings", "()", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
+  - addsTo:
+      pack: codeql/csharp-all
+      extensible: sourceModel
+    data:
+      - ["System.Configuration", "ApplicationSettingsBase", False, "GetPreviousVersion", "(System.String)", "", "ReturnValue", "file-write", "df-generated"]
+      - ["System.Configuration", "ApplicationSettingsBase", False, "GetPreviousVersion", "(System.String)", "", "ReturnValue", "file", "df-generated"]
   - addsTo:
       pack: codeql/csharp-all
       extensible: neutralModel
diff --git a/csharp/ql/lib/ext/generated/System.Diagnostics.model.yml b/csharp/ql/lib/ext/generated/System.Diagnostics.model.yml
index 825ccc11f5ce1..6954bec659dec 100644
--- a/csharp/ql/lib/ext/generated/System.Diagnostics.model.yml
+++ b/csharp/ql/lib/ext/generated/System.Diagnostics.model.yml
@@ -157,6 +157,12 @@ extensions:
       - ["System.Diagnostics", "TraceSource", False, "TraceSource", "(System.String,System.Diagnostics.SourceLevels)", "", "Argument[0]", "Argument[this]", "taint", "df-generated"]
       - ["System.Diagnostics", "TraceSource", False, "get_Listeners", "()", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
       - ["System.Diagnostics", "TraceSource", False, "get_Name", "()", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
+  - addsTo:
+      pack: codeql/csharp-all
+      extensible: sourceModel
+    data:
+      - ["System.Diagnostics", "Process", False, "get_ProcessName", "()", "", "ReturnValue", "file-write", "df-generated"]
+      - ["System.Diagnostics", "Process", False, "get_ProcessName", "()", "", "ReturnValue", "file", "df-generated"]
   - addsTo:
       pack: codeql/csharp-all
       extensible: neutralModel
diff --git a/csharp/ql/lib/ext/generated/System.IO.model.yml b/csharp/ql/lib/ext/generated/System.IO.model.yml
index c1681dd29f472..4dc5013b0d98f 100644
--- a/csharp/ql/lib/ext/generated/System.IO.model.yml
+++ b/csharp/ql/lib/ext/generated/System.IO.model.yml
@@ -247,6 +247,11 @@ extensions:
       - ["System.IO", "UnmanagedMemoryStream", False, "UnmanagedMemoryStream", "(System.Byte*,System.Int64,System.Int64,System.IO.FileAccess)", "", "Argument[0]", "Argument[this]", "taint", "df-generated"]
       - ["System.IO", "UnmanagedMemoryStream", False, "UnmanagedMemoryStream", "(System.Runtime.InteropServices.SafeBuffer,System.Int64,System.Int64)", "", "Argument[0]", "Argument[this]", "taint", "df-generated"]
       - ["System.IO", "UnmanagedMemoryStream", False, "UnmanagedMemoryStream", "(System.Runtime.InteropServices.SafeBuffer,System.Int64,System.Int64,System.IO.FileAccess)", "", "Argument[0]", "Argument[this]", "taint", "df-generated"]
+  - addsTo:
+      pack: codeql/csharp-all
+      extensible: sourceModel
+    data:
+      - ["System.IO", "Path", False, "GetTempPath", "()", "", "ReturnValue", "environment", "df-generated"]
   - addsTo:
       pack: codeql/csharp-all
       extensible: neutralModel
diff --git a/csharp/ql/lib/ext/generated/System.Net.Http.model.yml b/csharp/ql/lib/ext/generated/System.Net.Http.model.yml
index 8016ec6a65988..9c85c8e1adf18 100644
--- a/csharp/ql/lib/ext/generated/System.Net.Http.model.yml
+++ b/csharp/ql/lib/ext/generated/System.Net.Http.model.yml
@@ -65,14 +65,6 @@ extensions:
       - ["System.Net.Http", "SocketsHttpPlaintextStreamFilterContext", False, "get_PlaintextStream", "()", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
       - ["System.Net.Http", "StreamContent", False, "StreamContent", "(System.IO.Stream)", "", "Argument[0]", "Argument[this]", "taint", "df-generated"]
       - ["System.Net.Http", "StreamContent", False, "StreamContent", "(System.IO.Stream,System.Int32)", "", "Argument[0]", "Argument[this]", "taint", "df-generated"]
-  - addsTo:
-      pack: codeql/csharp-all
-      extensible: sinkModel
-    data:
-      - ["System.Net.Http", "StringContent", False, "StringContent", "(System.String)", "", "Argument[0]", "js-injection", "df-generated"]
-      - ["System.Net.Http", "StringContent", False, "StringContent", "(System.String,System.Net.Http.Headers.MediaTypeHeaderValue)", "", "Argument[0]", "js-injection", "df-generated"]
-      - ["System.Net.Http", "StringContent", False, "StringContent", "(System.String,System.Text.Encoding)", "", "Argument[0]", "js-injection", "df-generated"]
-      - ["System.Net.Http", "StringContent", False, "StringContent", "(System.String,System.Text.Encoding,System.String)", "", "Argument[0]", "js-injection", "df-generated"]
   - addsTo:
       pack: codeql/csharp-all
       extensible: neutralModel
diff --git a/csharp/ql/lib/ext/generated/System.Security.Cryptography.model.yml b/csharp/ql/lib/ext/generated/System.Security.Cryptography.model.yml
index d1a8a2cb2e0cc..afd8556bdbde7 100644
--- a/csharp/ql/lib/ext/generated/System.Security.Cryptography.model.yml
+++ b/csharp/ql/lib/ext/generated/System.Security.Cryptography.model.yml
@@ -119,9 +119,7 @@ extensions:
       extensible: sinkModel
     data:
       - ["System.Security.Cryptography", "SymmetricAlgorithm", True, "CreateDecryptor", "()", "", "Argument[this]", "encryption-decryptor", "df-generated"]
-      - ["System.Security.Cryptography", "SymmetricAlgorithm", True, "CreateDecryptor", "(System.Byte[],System.Byte[])", "", "Argument[0]", "encryption-decryptor", "df-generated"]
       - ["System.Security.Cryptography", "SymmetricAlgorithm", True, "CreateEncryptor", "()", "", "Argument[this]", "encryption-encryptor", "df-generated"]
-      - ["System.Security.Cryptography", "SymmetricAlgorithm", True, "CreateEncryptor", "(System.Byte[],System.Byte[])", "", "Argument[0]", "encryption-encryptor", "df-generated"]
   - addsTo:
       pack: codeql/csharp-all
       extensible: neutralModel
diff --git a/csharp/ql/lib/ext/generated/System.Threading.Tasks.Dataflow.model.yml b/csharp/ql/lib/ext/generated/System.Threading.Tasks.Dataflow.model.yml
index 75d0387aaf572..1555a3521a9b2 100644
--- a/csharp/ql/lib/ext/generated/System.Threading.Tasks.Dataflow.model.yml
+++ b/csharp/ql/lib/ext/generated/System.Threading.Tasks.Dataflow.model.yml
@@ -34,15 +34,22 @@ extensions:
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "AsObserver<TInput>", "(System.Threading.Tasks.Dataflow.ITargetBlock<TInput>)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "Encapsulate<TInput,TOutput>", "(System.Threading.Tasks.Dataflow.ITargetBlock<TInput>,System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "Encapsulate<TInput,TOutput>", "(System.Threading.Tasks.Dataflow.ITargetBlock<TInput>,System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>)", "", "Argument[1]", "ReturnValue", "taint", "df-generated"]
+      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "LinkTo<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>,System.Threading.Tasks.Dataflow.ITargetBlock<TOutput>)", "", "Argument[0]", "Argument[1]", "taint", "df-generated"]
+      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "LinkTo<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>,System.Threading.Tasks.Dataflow.ITargetBlock<TOutput>)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
+      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "LinkTo<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>,System.Threading.Tasks.Dataflow.ITargetBlock<TOutput>)", "", "Argument[1]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "Post<TInput>", "(System.Threading.Tasks.Dataflow.ITargetBlock<TInput>,TInput)", "", "Argument[1]", "Argument[0]", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "Receive<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "Receive<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>,System.Threading.CancellationToken)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "Receive<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>,System.TimeSpan)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "Receive<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>,System.TimeSpan,System.Threading.CancellationToken)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
+      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "ReceiveAllAsync<TOutput>", "(System.Threading.Tasks.Dataflow.IReceivableSourceBlock<TOutput>,System.Threading.CancellationToken)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "ReceiveAsync<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "ReceiveAsync<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>,System.Threading.CancellationToken)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "ReceiveAsync<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>,System.TimeSpan)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "ReceiveAsync<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>,System.TimeSpan,System.Threading.CancellationToken)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
+      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "SendAsync<TInput>", "(System.Threading.Tasks.Dataflow.ITargetBlock<TInput>,TInput)", "", "Argument[1]", "Argument[0]", "taint", "df-generated"]
+      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "SendAsync<TInput>", "(System.Threading.Tasks.Dataflow.ITargetBlock<TInput>,TInput,System.Threading.CancellationToken)", "", "Argument[1]", "Argument[0]", "taint", "df-generated"]
+      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", False, "TryReceive<TOutput>", "(System.Threading.Tasks.Dataflow.IReceivableSourceBlock<TOutput>,TOutput)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "IDataflowBlock", True, "get_Completion", "()", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "JoinBlock<T1,T2,T3>", False, "JoinBlock", "(System.Threading.Tasks.Dataflow.GroupingDataflowBlockOptions)", "", "Argument[0]", "Argument[this]", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "JoinBlock<T1,T2,T3>", False, "LinkTo", "(System.Threading.Tasks.Dataflow.ITargetBlock<System.Tuple<T1,T2,T3>>,System.Threading.Tasks.Dataflow.DataflowLinkOptions)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
@@ -65,6 +72,7 @@ extensions:
       - ["System.Threading.Tasks.Dataflow", "TransformManyBlock<TInput,TOutput>", False, "ReserveMessage", "(System.Threading.Tasks.Dataflow.DataflowMessageHeader,System.Threading.Tasks.Dataflow.ITargetBlock<TOutput>)", "", "Argument[1]", "Argument[this]", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "WriteOnceBlock<T>", False, "ConsumeMessage", "(System.Threading.Tasks.Dataflow.DataflowMessageHeader,System.Threading.Tasks.Dataflow.ITargetBlock<T>,System.Boolean)", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "WriteOnceBlock<T>", False, "LinkTo", "(System.Threading.Tasks.Dataflow.ITargetBlock<T>,System.Threading.Tasks.Dataflow.DataflowLinkOptions)", "", "Argument[0]", "ReturnValue", "taint", "df-generated"]
+      - ["System.Threading.Tasks.Dataflow", "WriteOnceBlock<T>", False, "LinkTo", "(System.Threading.Tasks.Dataflow.ITargetBlock<T>,System.Threading.Tasks.Dataflow.DataflowLinkOptions)", "", "Argument[this]", "Argument[0]", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "WriteOnceBlock<T>", False, "LinkTo", "(System.Threading.Tasks.Dataflow.ITargetBlock<T>,System.Threading.Tasks.Dataflow.DataflowLinkOptions)", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "WriteOnceBlock<T>", False, "OfferMessage", "(System.Threading.Tasks.Dataflow.DataflowMessageHeader,T,System.Threading.Tasks.Dataflow.ISourceBlock<T>,System.Boolean)", "", "Argument[1]", "Argument[this]", "taint", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "WriteOnceBlock<T>", False, "ReleaseReservation", "(System.Threading.Tasks.Dataflow.DataflowMessageHeader,System.Threading.Tasks.Dataflow.ITargetBlock<T>)", "", "Argument[this]", "Argument[1]", "taint", "df-generated"]
@@ -122,14 +130,9 @@ extensions:
       - ["System.Threading.Tasks.Dataflow", "BufferBlock<T>", "ToString", "()", "summary", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "BufferBlock<T>", "TryReceiveAll", "(System.Collections.Generic.IList<T>)", "summary", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "BufferBlock<T>", "get_Count", "()", "summary", "df-generated"]
-      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", "LinkTo<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>,System.Threading.Tasks.Dataflow.ITargetBlock<TOutput>)", "summary", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", "NullTarget<TInput>", "()", "summary", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", "OutputAvailableAsync<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>)", "summary", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowBlock", "OutputAvailableAsync<TOutput>", "(System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>,System.Threading.CancellationToken)", "summary", "df-generated"]
-      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", "ReceiveAllAsync<TOutput>", "(System.Threading.Tasks.Dataflow.IReceivableSourceBlock<TOutput>,System.Threading.CancellationToken)", "summary", "df-generated"]
-      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", "SendAsync<TInput>", "(System.Threading.Tasks.Dataflow.ITargetBlock<TInput>,TInput)", "summary", "df-generated"]
-      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", "SendAsync<TInput>", "(System.Threading.Tasks.Dataflow.ITargetBlock<TInput>,TInput,System.Threading.CancellationToken)", "summary", "df-generated"]
-      - ["System.Threading.Tasks.Dataflow", "DataflowBlock", "TryReceive<TOutput>", "(System.Threading.Tasks.Dataflow.IReceivableSourceBlock<TOutput>,TOutput)", "summary", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowMessageHeader", "DataflowMessageHeader", "(System.Int64)", "summary", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowMessageHeader", "Equals", "(System.Object)", "summary", "df-generated"]
       - ["System.Threading.Tasks.Dataflow", "DataflowMessageHeader", "Equals", "(System.Threading.Tasks.Dataflow.DataflowMessageHeader)", "summary", "df-generated"]
diff --git a/csharp/ql/lib/ext/generated/System.model.yml b/csharp/ql/lib/ext/generated/System.model.yml
index 25ab5c770529b..0dd7062773c2f 100644
--- a/csharp/ql/lib/ext/generated/System.model.yml
+++ b/csharp/ql/lib/ext/generated/System.model.yml
@@ -597,6 +597,13 @@ extensions:
       - ["System", "ValueTuple<T1,T2>", False, "ToString", "()", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
       - ["System", "ValueTuple<T1>", False, "ToString", "()", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
       - ["System", "WeakReference<T>", False, "TryGetTarget", "(T)", "", "Argument[this]", "ReturnValue", "taint", "df-generated"]
+  - addsTo:
+      pack: codeql/csharp-all
+      extensible: sourceModel
+    data:
+      - ["System", "Environment", False, "GetFolderPath", "(System.Environment+SpecialFolder)", "", "ReturnValue", "environment", "df-generated"]
+      - ["System", "Environment", False, "GetFolderPath", "(System.Environment+SpecialFolder,System.Environment+SpecialFolderOption)", "", "ReturnValue", "environment", "df-generated"]
+      - ["System", "Environment", False, "get_SystemDirectory", "()", "", "ReturnValue", "environment", "df-generated"]
   - addsTo:
       pack: codeql/csharp-all
       extensible: neutralModel