LYCOS RETRIEVER 
File Format: Extensions
built 195 days ago
One popular method in use by several operating systems, including Mac OS X, CP/M, DOS, VMS, VM/CMS, and Windows, is to determine the format of a file based on the section of its name following the final period. This portion of the filename is known as the filename extension. For example, HTML documents are identified by names that end with
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Zip file—1) A file that has been compressed, often with the .ZIP format originated by PKWARE. 2) A file on a Zip disk, not necessarily compressed. 3) A compressed file with the .EXE extension that is self-extracting (can be unzipped simply by opening it).
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MPEG4 is a file format that is commonly used to store media types defined by the ISO/IEC Moving Picture Experts Group, though it can store other media types as well. The files of this format usually have extension .mp4.
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