www.makemkv.com

When opening an ISO file, when there is a discatt.dat file in the same directory as the ISO, it's not used.

Could it be made that MakeMKV checks, if the discatt.dat is in the same folder as the ISO to check for the volume key?

the workaround for now is to extract the iso to a folder and stick it inside.

the issue is that one might store multiple iso's in a single folder and discatt.dat isn't meant to be associated with iso like that.

As an idea MakeMKV could check any .dat file in the same folder were the ISO is to see, if one contains a matching VUK.