How to repair a broken .EXE file association [duplicate]
Solution 1:
Open Notepad and save a text file (using a .reg extension) with the following content:
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\exefile\shell\open\command]
@="\"%1\" %*"
Double click the file then reboot.
DISCLAIMER: Use at your OWN risk! There is no guarantee that this will work!