If your windows 7 is unable to recognize .exe file and you are unable to run any .exe files, here is a quick fix.
Step 1:
We will make some changes in registry, so first step should be backup your registry.
Step 2:
Open Notepad and copy paste below codes.
Windows Registry Editor Version 5.00 [-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.exe] [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.exe] [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.exe\OpenWithList] [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.exe\OpenWithProgids] "exefile"=hex(0):
Save it as exefix.reg
Step 3:
Double click exefix.reg and run this .reg file
Step 4:
Restart your computer.
Now your .exe files should show proper icon and should run without any problem.