Win7 pure version can not choose the custom program in the open mode how to solve

1, the following suffix is ​​a PDF file named .pdf, for example, there is no application associated with this file;
2, double-click the above file After that, the “Open With” dialog box will appear, there is no application you want to use, and then click “"Browse” button;
3. After clicking, select the application you want in the pop-up interface, the application The program list still does not appear;
4, then open the win7 system under "Start - Run", enter "ldedit" in the run dialog box to open the registry editor (for security reasons, it is recommended to backup in advance) Registry);
5, and then expand and navigate to "HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\.pdf (here corresponds to your current file suffix, here with .pdf as an example) ” As shown, delete “OpenWithList&rdqu o; the following registry keys except "(default) & rdquo; & "UserChoice";
6, close the registry editor, double-click the file you need to open, browse in the open mode dialog and Choose the application you want to use.