extra: in case you’re curious, since the OP used %L but my example used %1: see this post for a link describing %1 vs %L in registry entries. In short: it doesn’t really matter in this case, because the difference is only significant on old 16bit windows OS (like Win3.11). On modern Windows, %L and %1 are interchangeable in the registry associations. (Only %1 works in .bat/.cmd files, though, which is why I’ve gotten used to using %1.)