I found a problem with CALL SYSTEM from Fortran under Windows 7 64 bits. The following small program: call system('dir') stop end shows the dir. Under Windows XP 32 bits the directory shown is the current working directory (it is correct). Under Windows 7 64 bits, the directory shown is the root directory n(it is a problem). The same program shows the current working directory (the correct) when I run it from cmd. Similar problems with other commands as delete, copy, etc. Regards.