Unassoc

Unassoc is a free program that allows you to disassociate certain formats from certain programs on Windows Vista and Windows 7. You probably know that with the standard tools of these operating systems, you can, for example, make the video in MKV format to open in the right multimedia players, and TXT-documents in your favorite text editor. So, Microsoft has not provided any tools for canceling such format bindings to certain programs. You can only "re-associate" the format with another program. But the cancellation can be done with this small utility.

The Unassoc interface consists of one small window and does not even need to be installed in the system to run it. Just download and run the executable file. So, what do you need to do to undo the association of a certain format with a certain program? To do this, simply enter the required extension (or select it from the list) in the "File types" field and press the "Remove file association" button. The application of the changes is instantaneous.

The program automatically generates a list of extensions that have an association. After deleting it, you can update the list by pressing the "Refresh list" key. There is also a key that deletes the specified extension from the list - "Delete file type". In general, this is the end of all the significant interface elements that Unassoc has. The developer tried to make the program as simple and understandable as possible.