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Make sure to back up your game files before overwriting them.
Run RDAExplorerGUI.exe to extract *.rda files.
(Optional:) If you want to save your changes back to an Anno 2205 or Anno 1800 *.rda file, you must afterwards also update file.db (located in maindata), else the game will likely crash on start. For Anno 1800 this tool also allows to generate checksum.db (located in maindata). file.db and checksum.db must be in sync.
Run FileDBGenerator.exe
Select the location of you maindata directory.
Specify where to save the new file.db, and possibly checksum.db. Once again: Make sure to back up your original file.db before overwriting it.
Click Generate and wait for the process to complete.
Changelog
RDAExplorerGUI
Remember last extraction location (#13 - thanks, @FroggieFrog!)
FileDBGenerator
Can generate checksum.db file (required when making changes to file.db in Anno 1800)
Generated file.db is much closer to the vanilla one, in terms of format. Makes it less likely the game will crash.