Be careful of hacking the code, but a work-around might be, in the C:

SetLastError(ERROR_FILE_NOT_FOUND); instead of <code>errono=ENOENT;
SetLastError(ERROR_INVALID_DATA); instead of <code>errno=EINVAL;
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Be sure to #include <windows.h> and the error code will be available through $^E. Maybe that's what you did? Personally I stay away from the C RTL error handling in Windows XS.