Here are the releasenotes.
Almost useless when its Windows only so far.
You missed the ‘So Far’ bit. That means this will change. Not so useless then perhaps. Apple can’t always be first 
Almost useless to you and the rest of the minority using apple rather than windows. However for us, in the majority, it is very useful. 
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Actually all you need to tag MQA file is simply two parameters, one to identify it is MQA encoded and the other one is to show the original sample frequency (OSF). You can use any editing software to Include the followings:-
Encoder MQAEncode
ORIGINALSAMPLERATE XXXXX
Where XXXXX is sampling frequency in Hz, for example 96000 is 96kHz
One can still playback without having MQA tagged and still get decoded but in most case playback software will not indicate the MQA information until it is playback.
Hey guys… been trying to download the app from the mqa website but I can’t … don’t know why…
Anyone who has downloaded it , could please share? I’m on Windows…
Thanks
Just use a metadata tag editor. You do not need a specialized app.
AJ
I’ve never used the app… sorry…
The app automatically check if the content is MQA or not and assign the info to the tag from the info it obtains from the PCM stream
Most MQA DAC should play fine without the tag and still be able to identify the info automatically (as long as you play bit perfectly into the DAC).
For some DAC, it relies on the tag. e.g. My Sony walkman (no matter under USB-DAC mode or playing the MQA file directly), it requires the tag to work well.