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File extensions tell us what kind of file it is.
For example, a .pdf extension tells us that it is an Adobe Acrobat file.
Files with the extensions of .jpg, .jpeg, .png, and .bmt are all picture files. (This is not an extensive list of picture files, just an example).
Other types of files like .doc, .dot, .dotx, .docx, are Word files. There are many more file extensions for that.
Powerpoint files have extensions like .ppt and .pptx.
Windows media files have extensions like .wmv.
Every software program has its own extensions that identify what it is.
In Windows Explorer (or Apple equivalent), you can organize your files by file type if you're looking for a specific type of file. It's also really helpful if you're tracking statistics on file types and usage, or finding a file that you need to use again.
The sort by file type feature is very handy when you have a high volume of files in a directory and you're looking for a document of a specific type.
If you don't know where you placed your file, you can do a global search on the file type (if you know it) and your computer will give you search results showing only the files with that extension.
Wiki User
∙ 7y ago
Wiki User
∙ 7y agoIn Windows the computer uses file extensions to determine the file type whereas other systems may use the magic number to determine a file format.
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