We have been using VLC Media Player as our media player of choice for a long time and generally are very happy with it. However we have one problem that has been challenging us for a while despite a few hours of searching the web for a possible solution.
I just tested a m4v file with VLC Version 2.2.1 and it works fine. (Not sure what type of media files you are trying to open) So here is what I did: Right click or ctrl+click on the media file Open with VLC The file opened just fine. To open ALL files by that type: Use the Get Info option. (in the picture) From there you can select. VLC media player requires Mac OS X 10.7.5 or later. It runs on any Mac with a 64-bit Intel processor or an Apple Silicon chip. Previous devices are supported by older releases. Note that the first generation of Intel-based Macs equipped with Core Solo or Core Duo processors is no longer supported.