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On FAT16 partitions, you are limited to 8 characters for the name plus 3 for the file extension. If you have FAT32 and a capable kernel, you can use up to 255 characters in total as a file name.
In the original MS-DOS of the pre-Windows 95 era, filenames were only allowed to have 8 letters, followed by a period '.', then only 3 letters for the file extension.

After Windows 95, filenames can have a maximum of 255 characters.

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Ethel Hauck

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