As discussed here: I created a DLL (x86 and x64) to do a file compare like the FC.exe does (only binary comparison!) but filling up the memory which can be read out by Autoit.   UDF _WinAPI_FileCompare.au3: ;Version v0.70 build 2024-03-23 beta #include-once ; #FUNCTION# ==================================================================================================================== ; Name ..........: _WinAPI_FileCompareBinaryString ; Description ..