Solving Windows 7 Favorites can't expand

The "Favorites" on the left side of Windows 7 Explorer provides the equivalent of "Shortcuts".




































But click on "Favorites" to enter the "Favorites", the shortcuts inside are not lost. I tried to right click on "Favorites" and select "Restore Favorites". The link has no effect. In other words, some reasons have caused the Windows 7 Explorer's "Favorites" failure to be used.
Answer: The favorites are emptied and the Explorer's "Favorites" solution cannot be expanded. The steps are as follows:
1, first run “regedit” (Registry Editor).
2, expand to HKEY_CLASSES_ROOTlnkfile
3, add a string value: IsShortcut, do not need to fill in the string value, press Enter
4, re-login.