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It doesn't use any part of the file. It gets the extension (the part after the dot) of the file name, and looks that up in the registry to see what program should be used to open, for example, a .doc file.

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13y ago
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7y ago

That is the file extension (the part of the name following the period. For example, exe for executable, txt for text document, doc for word processor document, etc. The default application for handling a given extension for Windows can be managed in the Control Panel (the exact method will vary from version to version, but will likely be something along the order of Control Panel -> Programs -> Default Programs -> Set Default Programs)

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12y ago

The file extension. (ie the letters after the full-stop)

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10y ago

electronic translation of scanned images of text documents

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12y ago

The extension. For example - a file with the extension .jpg is an image file, so windows will use a suitable program (windows media player) to open it.

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12y ago

It uses the three-letter extension (.com .exe - for example). The filename extension determines which program Windows uses.

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10y ago

The file extension.

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13y ago

File extension

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10y ago

The file extension.

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Q: What is the part of file name that helps the computer know what program to use to open a file?
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