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go to dosbox installation directory (on my machine that is C:\Program Files (x86)\DOSBox-0.74 ) as you see the version number is part of the installation directory name.
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run “DOSBox 0.74 Options.bat”
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the script starts notepad with configuration file: here change
windowresolution=1600×800
output=ddraw
NOTE: Non-windows users will want to use output=opengl instead.
(the resolution can’t be changed if output=surface – that’s the default).
- safe configuration file changes.