An error occurred while saving the commentJosso commented
Choosy supports the file if you drag the .url to the Choosy.app (which exists in ~/Library/PreferencePanes/Choosy 1.0.1.prefPane/Contents/Resources/Choosy.app)
Unfortunately it's not possible to open the file via "Get Info » Open With" as it is grayed out.
I guess it's just a matter of a few changes in Info.plist but I can't seem to get it to work.
It would be highly appreciated if we could get this to work with Choosy. :)