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Your problem appears to have nothing to do with Studio C++, or with C++ programming in general, but with RPCGEN.
At a guess, it appears that file "file.x" either does not exist, or has the wrong permissions, or a needed directory path has wrong permissions.
For example, if file.x is supposed to be created by RPCGEN but the directory path where the file goes either is not accessible, or the final directory does not have write permission, creating that file would fail.
If tracking down those various possibilities doesn't help, you should look for an RPCGEN forum.