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The exact definition, giving the criteria for deciding what part of the file name is its extension, belongs to the rules of the specific file system used; usually the extension is the substring which follows the last occurrence, if any, of the dot character (example: txt is the extension of the filename readme.txt, and html the extension of ...
On Microsoft Windows operating systems, a file is regarded as a text file if the suffix of the name of the file (the "filename extension") is .txt. However, many other suffixes are used for text files with specific purposes.
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)
Some other file systems, such as Unix file systems, VFAT, and NTFS, treat a filename as a single string; a convention often used on those file systems is to treat the characters following the last period in the filename, in a filename containing periods, as the extension part of the filename.
Some filenames are given extensions longer than three characters. While MS-DOS and NT always treat the suffix after the last period in a file's name as its extension, in UNIX-like systems, the final period does not necessarily mean that the text after the last period is the file's extension. [1]
File formats often have a published specification describing the encoding method and enabling testing of program intended functionality. Not all formats have freely available specification documents, partly because some developers view their specification documents as trade secrets, and partly because other developers never author a formal specification document, letting precedent set by other ...
Many computer systems use extensions in file names to help identify what they contain, also known as the file type. 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 ...
Digital Negative, a-publicly available archival format for the raw files generated by digital cameras At least 30 camera models from at least 10 manufacturers, and at least 200 software products DOC [75] [76] [77] A Document, or an ASCII text file with text formatting codes in with the text; used by many word processors Microsoft Word and ...