The issue was solved! It was necessary to use nullDC (I was already using, but in the wrong way). Chankast was not able to help me on this one, since I was trying to run a GDI (not CDI) file.
It was necessary to use these options on nullDC:
- Normal boot (to load the GDI file);
- Plugin (settings): "Image Reader plugin by drk||Raziel & GiGaHeRz|". You will find additional info here
https://writemyessay4me.org/research-paper
- Options -> GDROM -> Patch GDROM Region (should be always enabled, it seems some games will not run if this option is disabled).
And now the Virtua Tennis ROM can be played!
Thank you all.