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I am using a certain file type (.QTZ) which I have successfully linked to an application. When I double click, the correct application starts. However, in Windows Explorer, it still says it is a "QTZ File".

How can I change that type description? I have found the "Default Programs" tab in the Control Panel, but it only lets me edit associations, not file types.

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1 Answer 1

up vote 9 down vote accepted
  • Launch regedit.

step1

  • In HKEY_CLASSES_ROOT, find your extension (you just have to type .qtz). Example with .ods file:

step2

  • Look for the Data of the (Default) value (in my case, opendocument.CalcDocument.1, but in yours, something related to your application), and find this name in HKEY_CLASSES_ROOT again, by typing the first letters. Example with opendocument.CalcDocument.1:

step3

  • Change the Data of the (Default) value to the description you want.

step4

  • Close regedit.

To see your changes appear, you can either reboot, or change the default association of some file by choosing "Open with > Choose default program..." (I couldn't find the proper method). Here is the result:

result

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