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[tienkhoanguyen]

Well depending on what game type you have you could do it two or three ways.

If you have the CD bought then you would mount like this after double clicking on DOSBox 0.74.

mount c c:\
mount d d:\ -t cdrom
d:
dir /w/p

Then look for one of the following files:

Setup.exe
Install.exe

If you cannot find one of the above look for something along the line of the above. Sometimes it is the name of the game itself plus the exe at the ending. Or a bat at the ending.

Once you've found one of the above just type what you found and the setup begins and you just follow the instruction on the screen.

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If you have a ISO copy of the game you could IMGMOUNT however I'm not that good at it.
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If you have a zip folder you usually extract it to the C:\ directory and mount it.