How to Disassociate File Extensions
Windows 7 makes it easy to associate a file extension with a program, but removing this association is not at all obvious. Windows 7 does not include a graphical solution, meaning you cannot locate the file extension in the "Set Associations" interface and choose to delete it. However, Windows 7 does recognize textual commands that can disassociate specific file extensions. To use these commands, you need to enter them using the Command Prompt.
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Instructions
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Click the Windows 7 "Start" orb and type "cmd" in the search field.
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Right-click "cmd" in the search results and select "Run as Administrator."
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Type "assoc .EXT=" in the command prompt. Replace ".EXT" with the extension you wish to disassociate, such as ".txt" or ".avi". Press "Enter" to remove the association to this file extension.
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