However according to my testing, it can only safely be done on Windows 8.1 and Windows 10. To fix them, a trick can be done which forces Windows to scale the app using DPI virtualization. Such apps render improperly on full HD or 4K resolutions. However there are some apps which lie to Windows that they are high DPI aware even if they are not, which is why Windows does not scale them. Windows normally scales all apps automatically using XP style scaling as well as DPI virtualization for those apps that don't tell Windows that they are DPI aware. Often buttons are misplaced or too tiny to click for old apps which haven't been updated for high DPI displays. They appear too small on the screen with impossible to read fonts and they don't scale properly. Typically, such apps were written before high DPI displays appeared and were not properly updated to support high DPI. Let us see how to fix them if Windows 8.1 or Windows 10 does not scale them properly. They look too small for the screen resolution. However, there are some third party apps, which don't render properly on high DPI screens. At such resolutions, Windows automatically turns on DPI scaling so everything on your screen becomes larger. Or you may have a desktop monitor with 4K resolution. Today, many PCs ship with very high resolution displays even if the PC form factor is smaller for example, an Ultrabook or a tablet.

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