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What makes a valid Windows file name?

A common question for people starting to program on Windows is, “What makes a valid Windows file name?” You want to use this information to make simplifying assumptions in your code: that names can be no longer than MAX_PATH, that two names won't differ only by case, etc. Unfortunately, the answer to what makes a valid file name in Windows is not simple.


Due to the layering of Windows architecture, the definition of a "legal" file name may vary depending upon the component of the






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