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The length of a file name is generally limited by the combination of OS and filesystem.

Most common configurations:

Windows XP/7 on NTFS has a max path+filename+ext (yes, full path and filename combined) length of 260. Path and folder take a minimum of 3 characters ("C:"), so you are left with effectively 257.

Windows 98/95/3.x/DOS on FAT32 had max filename+ext length of 8+3.

Most Linux/Unix filesystems have max filename+ext length of 255

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