diff --git a/app/src/main/java/net/gsantner/opoc/util/GsFileUtils.java b/app/src/main/java/net/gsantner/opoc/util/GsFileUtils.java
index 524ba77ec..19a687228 100644
--- a/app/src/main/java/net/gsantner/opoc/util/GsFileUtils.java
+++ b/app/src/main/java/net/gsantner/opoc/util/GsFileUtils.java
@@ -524,7 +524,7 @@ public static String getMimeType(final File file) {
 
     public static boolean isTextFile(File file) {
         final String mime = getMimeType(file);
-        return mime != null && (mime.startsWith("text/") || mime.contains("xml"));
+        return mime != null && (mime.startsWith("text/") || mime.contains("xml")) && !mime.contains("openxml");
     }
 
     /**