If you cannot associate an extension to a program

Normally you right click on the desired extension and choose "Open With" and you get a selection to "Choose Another App." You can then select the App for for which the extension will be associated with-case closed. What if you right click and select the App but, cannot install it because Windows does not recognize the extension, yet it exist on your computer. That's what happened to me with RAF and RW2 extensions. I solved the problem by indexing the files. Then Windows 10 recognized them and I could proceed. No problem however, with Windows 7-go figure-progress.

pepegotme said:

Normally you right click on the desired extension and choose "Open With" and you get a selection to "Choose Another App." You can then select the App for for which the extension will be associated with-case closed. What if you right click and select the App but, cannot install it because Windows does not recognize the extension, yet it exist on your computer. That's what happened to me with RAF and RW2 extensions. I solved the problem by indexing the files. Then Windows 10 recognized them and I could proceed. No problem however, with Windows 7-go figure-progress.

I first enabled Windows 10 indexing. Then disabled it again after the recognition took place.