by Barry Dysert
(last updated February 29, 2016)
Believe it or not, file name limits aren't all that easy to come by. The reason it's difficult is because you have limits imposed by NTFS itself, limits imposed by the Windows operating system, and limits imposed by the application dealing with the files (e.g., Windows Explorer).
Experimentation reveals that for a file created at "C:\", you can create a file name with at most 255 characters. If you were to try to create a file with a longer path (e.g., "C:\Documents"), the length of the file name would have to be reduced accordingly. This implies that in addition to the length of the actual file name, you also have to deal with the name of the path, which, according to Microsoft, is set at 260 characters for local files.
File names can use any character in the current code page, including Unicode characters and characters in the extended character set (128–255), except for the following:
This tip (5835) applies to Windows 7, 8, and 10.
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