Account closed as requested
If you have access to both clean installed N and non-N versions, you may try to compare content of registry keys
and set it similarly to N version - but this will probably completely disable video playback for .mov files.
Or you may look at values under OpenWithProgids subkey - they refer to other class keys. Try to delete all ShellEx subkeys under all mentioned locations - this should only disable Explorer icons generating.
Any registry manipulation can be automated using .reg file, .cmd file which includes reg.exe command calls or group policy.