It is not easy, but it can be done manually. If you are interested in doing that, here it goes:
Open explorer.
Go to tools->folder options
Select File types
Scroll to the extension you want to change, avi for example.
Click on it and on the lower part of the window the Advanced button became active. Click on it.
In the upper textbox it is writen the description youwant to change. Change it, according to your desire.
I use the descriptions "BSPro AVI File" for example.
After modifying the extension, press OK. Do the same with every extension and when finished, press the OK again.
Voila !
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