by Barry Dysert
(last updated September 5, 2016)
One of the interesting things about Windows is that a file's "type" determines what program is used to open that file. For example, .txt files are, by default, opened with Notepad. If you have Microsoft Office installed, .docx files are opened with Microsoft Word, etc. You may, however, not want the default program to be used with a particular file type.
Unfortunately, without the use of third-party tools, there is no way to remove a file type program association. The best we can do is to change the association to another program. To do this, go to the Control Panel and click on Default Programs. (In some versions of Windows you may need to click on Programs before you can click on Default Programs.) (See Figure 1.)
Figure 1. Seeing existing file type associations.
Click the Associate a File Type or Protocol with a Program link. Windows displays the Set Associations screen which lists all the file types that your system knows about and the programs with which they are associated. (See Figure 2.)
Figure 2. Changing file type association.
To make a change, click on the extension whose default program you want to change and then click the Change Program button. You are then presented with an "Open With" dialog box that looks very much like a standard Open dialog box. Use the controls in the dialog box to select a displayed program or browse to the program that you want to associate with the extension. Once you select the program, OK your way out, and now that file extension will be associated with the program you chose.
This tip (12827) applies to Windows 7, 8, and 10.
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