Cheat Engine

[atom0s]

You can use 'GetFileAttributes' instead which is exported from kernel32.dll and guaranteed to be available in every process. If the function fails, it will return 'INVALID_FILE_ATTRIBUTES' which allows you to determine if the file is on disk or not. You can also pull the specific reason for failing from GetLastError.

If you need more info see:
https://msdn.microsoft.com/en-us/library/windows/desktop/aa364944(v=vs.85).aspx
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