![]() The extension for the file "image.jpg" is ".jpg," and ".jpg" in turn is the file type that Windows looks at when determining which program to use when opening. ![]() This relationship between file types and the programs used to open them is accomplished by a table in the Windows registry which keeps track of these "associations."įile types are defined by the file's extension, which is the part of the filename to the right of the last dot in the filename. This happens because Windows recognizes that MS Word is the program to use when opening ".doc" files. If you double-click on a file on your desktop that ends in ".doc," MS Word is started and your document is opened.
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