Hello George.
Thank you for contacting us. Please have a look at ( http://avgclick.me/restorechangesbyAVGPCTuneup ). If the issue persist even after doing this, it is not AVG PC Tuneup which has changes the icon appearance. Thank you.
Is there any settings in the AVG Tune-up that would make mp4 videos show up as an icon instead of a thumbnail? For some unknown reason mine has changed within the last few days.
Thank you
Thank you for trying it out, George. Please have a look at this Microsoft support article https://support.microsoft.com/en-us/kb/812003 to modify your folder view settings. Thank you.
Thank you for speedy reply. The solution did not work for me. I'll look elsewhere.
George