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This is a list of file formats organized by type, as can be found on computers. Filename extensions are usually noted in parentheses if they differ from the format name or abbreviation. In theory, using the English alphabet (A–Z) and a three character extension, the number of combinations amounts to 17,576 (26³). If other acceptable characters are included, the maximum number of combinations is 195,112 (26+31)³. Unix-like systems don't have extensions, and Microsoft Windows NT, 95, 98, and Me don't have a three character limit on extensions for 32-bit or 64-bit applications on file systems other than pre-Windows 95/Windows NT 3.5 versions of the FAT file system, so some file system types are given extensions longer than three characters.