I found a game that was zipped into 2 folders.
One folder was labeled "IRON_CD".
I placed this in the emulated CD "D" drive and added the following to the Autoexec line in Dosbox:

mount d C:\Games\cd\ -t cdrom -label IRON_CD

And the other folder was labeled "games", which had another folder in it called "IRON".

This I placed in the "C" drive. I changed directory to this folder, and type
"Iron" to start the game, and the error message "cannot find MATH.DAT"
pops up. I found the file in the IRON_CD folder. But it seems there is a mounting issue.
I tried adding "-aspi or -ioctl or -usecd 0 flags in different combinations, but no go. Is there something wrong with the way I did this?