Virtual Folder Filtering

To set filters for write *.sln into File mask to show files and leave Files mask to hide files empty.

Also note there are two tabs with name "Filtering folder". One for the current menu and other for sub-menus. So if .sln files are in subfolders you must set "show" filter in the "sub-menus filters".

Also if .sln files are in the subfolders then set the "Folders processing" into "Show folders". If you set this option into any other value then TLB hide all sub-menus.

version 3.2 working same way but don't have extra tab for submenus options.

I hope this helps.