but not all the other file types MKVToolNix can read. There are two
reasons for it:
1. Even though the file association is registered as `Alternate`,
which should be the lowest one, users have reported that installing
MKVToolNix causes it to take over all file type associations it
supports.
2. Even when changing the association manually afterwards, the icons
the Finder shows for the supported file types are all MKVToolNix
icons.
Fixes#3588.