My comments assume that these are .kar files
If so try opening one in RB and see what happens. I used to use .kar file exclusively in RB to make all my cover tunes


HP Win 11 12 gig ram, Mac mini Sonoma with 16 gig of ram, BiaB/RB 2026, Reaper 7, Harrison Mixbus 11 , Presonus Audiobox USB96