It is right that some Apps. like Registry Easy do modify Windows 7 Registry, such as in case above or mine-as in illustration bellow. Before one tries Sys. Restore can simply access Registry Editor-Regedit.exe(typed in Start, Search Progs and Files) look for: HKEY_CLASSES_ROOT and make sure this key(.library-ms) does exist : HKEY_CLASSES_ROOT\.library-ms. If it doesn't or is modified needs to be created or corrected-modified creating and modifying strings and value data as follows:
Name: Default, Type: REG_SZ, Value Data: LibraryFolder
and in second line :
Name: Content Type, Type: REG_SZ, Value Data: aplication/windows-library+xml
* To create them: right click in right panel of RegEditor, click: New, String Value.
Close RegEditor, you might wanna delete the 4 damaged files in Library Pane, and restart PC. It worked for me. The correct files will show up after restart.