File Naming

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All current operating systems allow strings of one to eight letters as legal file names.

Windows file systems: FAT-16, FAT-32, NTFS, ReFS (Resilient File System)

File extension is the part following the period in the file name.

In Windows file names are 1-8 characters plus optional extension of 1-3 characters.

In UNIX the size of the extension is up to the user, and a file may have two or more extensions.

Extensions are conventions in UNIX but Windows is aware of the extensions and assigns meaning to them.