One possibility (on Windows) is that a virus checker or an indexer may be leaping in and using the files. Are these 50 files always different, or the same ones each time you run?

Since these are C files: there are some occasions where Visual Studio retains locks if (when?) it crashes. Generally opening the file with VS then closing it again (without crashing) should clear it.

In reply to Re: Access is denied by cdarke
in thread Access is denied by debugger

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