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A file name must start with a letter or number, a period must occur at least once each 8 characters, two consecutive periods could not appear in the name, and must end with a letter or digit. [2] By convention, the letters and numbers before the first period was the account number of the owner or the project it belonged to, but there was no ...
Should filename be one or two words? There seem to be no strict convention; google finds 20M pages containing "file name" and 30M pages containing "filename". This indicates that "filename" is a slightly better choice, but still, over 400 articles in wikipedia contain the subword "file name".
The Multics file system stores the file name as a single string, not split into base name and extension components, allowing the "." to be just another character allowed in file names. It allows for variable-length filenames, permitting more than one dot, and hence multiple suffixes, as well as no dot, and hence no suffix.
Lists of filename extensions include: List of filename extensions (0–9) List of filename extensions (A–E) List of filename extensions (F–L) List of filename extensions (M–R) List of filename extensions (S–Z)
On Windows computers, extensions consist of a dot (period) at the end of a file name, followed by a few letters to identify the type of file. An extension of .txt identifies a text file; a .doc extension identifies any type of document or documentation, commonly in the Microsoft Word file format; and so on. Even when extensions are used in a ...
Filename extension is usually noted in parentheses if they differ from the file format's name or abbreviation. Many operating systems do not limit filenames to one extension shorter than 4 characters, as was common with some operating systems that supported the File Allocation Table (FAT) file system.
One popular method used by many operating systems, including Windows, macOS, CP/M, DOS, VMS, and VM/CMS, is to determine the format of a file based on the end of its name, more specifically the letters following the final period. This portion of the filename is known as the filename extension.
A Document, or an ASCII text file with text formatting codes in with the text; used by many word processors Microsoft Word and others DOCM: Microsoft Word Macro-Enabled Document Microsoft Word: DOCX [78] Microsoft Word Document Microsoft Word: DOT [78] Microsoft Word document template Microsoft Word: DOTX [78] Office Open XML Text document ...