Win7 open mode restore, how to restore open mode?

I just changed the way an application is opened, and now all applications on the computer are opened with that one. I just changed the opening method of an application with QQ2010. Now all the applications on the computer are opened with QQ2010 (the itch of the hand itch), then how to restore the open way? After some groping, I found a very simple solution: create a new Notepad file.

My system is Win7, but it is also suitable for Windows XP and Visat systems that are not open properly. The figure is my problem:

Open reduction method:

The following is the content of the code font INF file, copy this code, paste it into Notepad In this case, save it as an arbitrary file name with a file name INF, for example: 1.inf

[Version]Signature="$Chicago$"[DefaultInstall]DelReg=DeleteMe[DeleteMe] HKCU,"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\.exe"HKCU,"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\.lnk" 
 Ok! When you select the right mouse button menu "Install", the icon will be restored on the Windows 7 desktop, and the restore open mode can be opened. Simply save it as an INF file, right click and select “Install” to restore it.