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Changing file extention

by TivoBoxBoy / April 13, 2009 9:47 PM PDT


I have always wondered about this... We have an application that creates a file with a ".pro" extention. Part of our process is to change the file's extention to "dbf" so it can be read by access. I can also change it to a .txt file and open it with notepad.

What does changing the files extention do, it seems like all it does is tell which program to use to open it?


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Simple text files. . .
by Coryphaeus / April 13, 2009 11:15 PM PDT

will do this. They can also be a .log file and a .bat file and some .ini files. But other programs cannot have their extension changed and still work. Try changing a .dll file to something else. Or .exe to .com.

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Yep that's right.
by MarkFlax Forum moderator / April 14, 2009 9:14 PM PDT

"it seems like all it does is tell which program to use to open it"

That's it essentially. In Windows, (I don't know other OSs but i assume they are the same), the file extension 'associates' that file with a particular process.

Notepad will open most files if you drag a file into the Notepad window, (Wordpad for larger files), but other than that the file extension identifies which application is needed to use that file properly.


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