Welcome to the forum..
Unfortunately,Safari is not yet supported. have a look RoboForm
Go to bottom, you'll find what I mean.
BTW, you should post this thread at Software or Lounge
Have you try SUPER ?
If you tried everything above but MKV files still doesn't work,you will need to do something else.You will have to find out what codecs was used in. I recommend this steps to try :
1. Download n install VideoInspector or
2. MatroskaDiag.This tool will check if you have what you require installed n if you don't.
Still have problem after follow the steps above ?
You are most likely facing a DirectShow problem.That's it.
Hope this help
It depends on your needs.They both is good archiver.Peazip has full support for Uncommon Format like PEA.
I have 7-Zip & Izarc.Maybe this link can help you File Archiver Comparison