Ok, found a workaround, I installed the game at the
same folder as the image just using the virtual CD (installer works with no DosBox). From there, just drag the .cue image to DosBox icon.
Once all drives are mounted, switch to C: and cd to the game route and run the executable in DosBox`s command line. It worked.
Maybe all this is a silly discovering on my part, but I´m pretty new to DosBox
Thx Smiling Spectre for the help