ASFC - Version 1.1 ASFC is a file comparison tool which has no problems with .exe, .zip and other binary files. Of course text file comparison is possible, too, and unlinke other tools it will show you differences within lines. Besides being a mighty file comparison tool, ASFC features an automatic patch generator. You compare two files click on "create patch", that's it. You'd actually not even have to look at the content of the files to create a working patch executable.