Did you accidentally change the option or setting when you trying to open a files?
Then after selecting open with your file turn something like this.. Same Icon
1.Download these two files.
2.After downloading the 2 files Open Task Manager by Pressing Ctrl+Shift+Esc.Go to Process" End Process" explorer.exe
3. Click File tab then click New Run-Browse click all files open lnk fix 7
4. Same as step 3 New task then find Rebuilt_Icon_Cacher then Restart.it will ask you y/n type Y
Finish!! all back to default