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This question provides context: Windows 10 system font size change

In this question is a way to increase system font size by 25%. Also, in liked help I found "create a custom DPI scale".

Open Screen Resolution by clicking the Start button Picture of the Start button, clicking Control Panel, and then, under Appearance and Personalization, clicking Adjust screen resolution.

Click Set custom text size (DPI) in the left pane.

Click the scale (ruler), drag the setting to whatever percentage size increase you want (100%-500%), and then click OK. (If you prefer, you can type a number between 100 and 500 in the box next to Scale to this percentage of normal size, and then click OK.)

On the Display screen, click Apply.

However, this is obsolete (Win 7), I am looking for a way to do this on Windows 10.

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The problem is, indeed, with the fonts used for MS Shell Dlg which, by default, is Microsoft Sans Serif. The latter is described as "metrically compatible with the MS Sans bitmap font" which hints at why high-dpi scaling can get messed up.

Solution: locate

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\FontSubstitutes

in the registry and change MS Shell Dlg to something else - Arial or Tahoma will work, but to look like the rest of Windows I chose Segoe UI.

  • I believe OP asked about how to change the size of the current font, not how to change the font altogether. – cascer1 Oct 11 '16 at 13:02

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