David Roche

Recently upgraded from M11 2014 Sp3 to 2017 SP1.

After update, .res11 files were no longer associated with the MikeView .exe program. 

The normal windows process of associating a file extension with a specific program didn't work.  After highlighting the MikeView executable in the "browse" window and hitting OK, I was taken back to the "open" with dialog and the MikeView.exe executable does not appear there.

Turns out that the registry path wasn't updated properly when 2017 SP1 was installed (seems that most other files were updated correctly).  The solution below worked for me.

From https://answers.microsoft.com/en-us/windows/forum/windows_7-files/problems-with-file-association-in-windows-7-64-bit/8a84fcec-22df-4942-8e35-d98dbe96e327?auth=1

The program that you're pointing to isn't registered correctly.

In regedit: Navigate to Computer\HKEY_CLASSES_ROOT\Applications and find your .exe name.
Navigate under its name to shell>open>command. In the Default change its location to the actual location of the executable, hit okay and then try and reassociate the file type as you normally would.

Thanks to the OP on answers.microsoft.com.