f2c.exe.Z is a compressed MSDOS version of f2c that should run on just about any MSDOS machine. It was compiled with Borland C++ version 3.1. f2cx.exe.Z is a compressed MSDOS version of f2c that requires an 80386 or 80486, as it uses extended memory. It was compiled by the SVS C compiler, and it generally can translate larger Fortran files without running out of memory than can f2c.exe. "xsum f2c.exe f2c.exe.Z f2cx.exe f2cx.exe.Z" should give you: f2c.exe e0537406 272068 f2c.exe.Z 8d9a8f8 176183 f2cx.exe 1580cf21 370422 f2cx.exe.Z ec49303 255601 Last update: 1 June 1993