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Message: [QUOTE="Claudio Grondi, post: 1920676"] Using MSVC++ .NET 2003 compiler (if I did it all the right way): fstm = fopen("bigfile.dat","r+"); if(fstm == 0) { printf( " ErrNo: %i \n", errno ); } // ^-- prints : // on "r+" with too large file: 22 (EINVAL-Invalid argument) // on non-existing file : 2 (ENOENT-no such file) // on bad mode string spec. : 0 (??? why not EINVAL ...) So there _is_ a way to distinguish the different problems occurred while opening the file. The error message comes from Python (errnomodule.c), not from Windows(errno.h). Concluding from this it becomes evident for me, that this misleading error message is Python fault (even if originated by misleading errno values set after fopen in the MSVC++ environment and Windows), right? Probably also in Python 2.5? Claudio Grondi [/QUOTE]