How Can I Check if a String is a Valid Windows File Name?

Verification of file name validity under Windows system

On Windows systems, to verify whether a given string is a valid file name, you need to follow the established naming convention. These conventions state that the file name must be:

Prohibited characters:

• Less than sign (<)
• Characters with ASCII value less than 31, including line breaks
• Forward slash (/), backslash (), colon (:), vertical bar (|), question mark (?) and asterisk (*)
• Reserved DOS device names: CON, PRN, AUX, NUL, COM1-9, LPT1-9

Other inspections:

• The file path containing the file name should not exceed 260 characters without using the extended path ?\ prefix.
• Unicode file paths using ?\ may exceed 32,000 characters, but directory expansion may cause overflow.
• File names should not consist of periods only.

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