PEChecksum works with 32 and 64 bit files. The checksum needs to be updated on critical Windows file if their resources (or other things) are changed. All command line arguments are treated as files to update checksums for. It is written in C.
Full Specifications
What's new in version
General
ReleaseOctober 1, 2010
Date AddedMarch 4, 2010
Operating Systems
Operating SystemsWindows 2003, Windows 2000, Windows Vista, Windows, Windows 7, Windows XP