Hello, I heard some rumours about a missing MD5 function in AutoIt. Well I made a very quick conversion from a Visual Basic sample. It works, but it does not use the optimized AutoIt functions for shifting bits. So it is rather slow, but since AutoIt does not have full binary support you will never be able to create a MD5 checksum from binary files. Regards, -Sven TestMD5.AU3 MD5.au3