Old Dos application doesn't work on the windows vista and windows 7.

I have some old DOS based application which are not running under windows xp and 7. I have enabled compatibility options from properties but still don’t work. I need this application as I still refer those.
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Sushil SonawaneAsked:
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I had similiar and i tried using Dos emulator called DOSBox. You need to install the mount the particular path and run the application.


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Dave BaldwinFixer of ProblemsCommented:
What applications?  I have a couple of DOS applications whose memory managers are not compatible with any version of Windows.  I have to keep a DOS/Windows 3.11 machine around to run them.
Bill HerdeOwnerCommented:
Agreed, Which applications.  I also have a couple that connect to com ports for machine controls. dosbox and other dos shells break at the api for the com port.  They simply will not work on anything past windows 3.1.  
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