How to force a file association in Windows 7? (Regedit?)

I have good experience with Default Programs Editor - "powerful, multi-featured file association utility for Windows". Free and small, no install needed. I googled it while I was looking for some user-friendly way to change file icons :-)

This is for win8 might work under win7 too, haven't tested it there.

Create new txt file and open it in any text editor. Copy the following text into it:

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\.scr]
@="scr_auto_file"

and alter the .scr to the file extension you like to change, also after the @="scr then save the txt file, BUT make sure you put the new filename of the txt file in Qoutes, for example "newAssociation.reg" that is important, otherwise you end up having a "newAssociations.reg.txt" file. Once the new file was saved correctly, you can doubbleclick it, and you are done, you may now open the file you like with a new program you can select.

Nirsoft's FileTypesMan, did the trick for me