Mdf image but no mds file, what can I do?

Hi everybody, I got an mdf image file but do a friend deleted the mds file not knowing that alcohol needs both files. alcohol doesn’t recognize the mdf file, so my question is: is there a way to remake the mds file from a mdf (using other deamon tools, …).
tnx for the help

Just remake your image from the origional game disc

I solved the problem by enaming it to .iso, it works perfectly.