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I was required to develop a Windows app UI for a fixed resolution - it doesn't matter if it makes sense or not, the customer requires it. I'm using a Windows Server 2003 VirtualBox VM as the development environment; my host machine has much higher resolution.

Is there any way to select and fix the OS resolution and stop VirtualBox changing it by any kind of scaling? I can't see the requested resolution when I open Display Properties on the guest OS.

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So I tried this, and might work for you. Under the Machine menu, there is an option to auto-resize the guest OS's resolution to fit the monitor you are using. I got the resolution you did by enabling this option, manually resizing the window to get the resolution I wanted, then DISABLING auto-resize. Then, it's "stuck" there and I can resize the window, move it around, resolution doesn't change. Only problem was the taskbar. While you are doing the resize, might help to minimize it to get the exact resolution

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Try installing Guest Additions. It provides lots more features to the guest OS. From there, you can leverage the resolution you want and lock the screen in that position.

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I have Guest Additions. Problem is the resolution I need is never allowed as in the resolution selection slider in guest OS. –  Random Jun 24 '11 at 2:40
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What is the resolution, exactly? –  CamronBute Jun 24 '11 at 12:56
    
You may need to install the guest additions when running in safe mode. I have seen several instances where the video driver did not completely install when not in safe mode - particularly for 3D acceleration. –  Goyuix Jun 24 '11 at 19:03
    
Requested resolution is 1440x900 (HP LE1901w native) host resolution is 1920x1080 –  Random Jun 25 '11 at 10:19
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So I tried this, and might work for you. Under the Machine menu, there is an option to auto-resize the guest OS's resolution to fit the monitor you are using. I got the resolution you did by enabling this option, manually resizing the window to get the resolution I wanted, then DISABLING auto-resize. Then, it's "stuck" there and I can resize the window, move it around, resolution doesn't change. Only problem was the taskbar. While you are doing the resize, might help to minimize it to get the exact resolution –  CamronBute Jun 25 '11 at 15:57
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