After adding the new product "TF3680 - TC3 Filter" as a reference, some new files were automatically generated after compilation:

_ModuleInstall/TcFilter/TwinCAT CE7 (ARMV7)/TcFilterW32.dll
_ModuleInstall/TcFilter/TwinCAT CE7 (x86)/TcFilterW32.dll
_ModuleInstall/TcFilter/TwinCAT RT (x64)/TcFilter.sys
_ModuleInstall/TcFilter/TwinCAT RT (x86)/TcFilter.sys

After contacting Beckhoff support, it was concluded that the folder "_ModuleInstall" could be omitted from version control, thus this addition.

TwinCAT3.gitignore

@@ -21,4 +21,5 @@ LineIDs.dbg
 LineIDs.dbg.bak
 _Boot/
 _CompileInfo/
-_Libraries/
+_Libraries/
+_ModuleInstall/