XP recovery EXE file association

All EXE files suddenly all EXE files are not open. The solution is as follows:

The EXE file is related to the error, because the appearance of this situation is mostly caused by the virus, and the main file of anti-virus software is an exe file, since the exe file is associated, how can I run anti-virus software? Fortunately, XP provides command line tools in secure mode for us to use, you can use the command line tool to solve this problem. Enter: Assoc .exe = exefile , ".exe = exefile" will be displayed on the screen. Now turn off the command prompt window, press the Ctrl Alt Del Combination button to call up the Windows Security window, press the "Shutdown" button to select the "Restart" option, press the normal mode to start Windows, all EXE files can be normal. Run!

I am a normal mode to change cmd.exe into cmd.pif, and then execute assoc .exe = exefile.