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Using a larger-than-native resolution without scrolling in Windows 7

In the Windows Registry, at HKEYLOCALMACHINESYSTEMControlSet001ControlClass{4D36E968-E325-11CE-BFC1-08002BE10318}000

find or create DWORD Display1_DownScalingSupported and set it to 1

Open the display driver's control panel and create a custom resolution larger than native, but with the same aspect ratio. In my case, native is 1280x1024, and I want a vertical resolution of 1200, so 1280/1024*1200 = 1500, my new horizontal resolution.

Select Test, and if it works, you're in business!