Alec S. said:
I can't actually test this right now because I keep getting an error when I
try to change the system font size. However, if I remember correctly (it's
been quite a while since I was last able to do so), what it does is to use
the DPI as a sort of "font size". I'm not sure of the relationship, but it
seems to map to point sizes. Try using the second method, does that affect anything?
Great news! I fixed it (well, my problem at least.) I figured out why I was getting that error message and fixed it in a snap.
The reason that it's great for you is that now that I can actually change the font size, I was able to trace the changes to the
registry. Here are the four registry keys that the control panel applet modifies (in order):
Set to tiny (72 DPI)
HKLM\Software\Microsoft\Windows NT\CurrentVersion\FontDPI\LogPixels - 0x60
HKLM\System\CurrentControlSet\Hardware Profiles\Current\Software\Fonts\LogPixels - 0x60
HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\Current\Software\Fonts\LogPixels - 0x48
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontDPI\LogPixels - 0x48
Set to default (96 DPI)
HKLM\Software\Microsoft\Windows NT\CurrentVersion\FontDPI\LogPixels - 0x60
HKLM\System\CurrentControlSet\Hardware Profiles\Current\Software\Fonts\LogPixels - 0x60
HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\Current\Software\Fonts\LogPixels - 0x60
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontDPI\LogPixels - 0x60
Set to large (120 DPI)
HKLM\Software\Microsoft\Windows NT\CurrentVersion\FontDPI\LogPixels - 0x78
HKLM\System\CurrentControlSet\Hardware Profiles\Current\Software\Fonts\LogPixels - 0x78
HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\Current\Software\Fonts\LogPixels - 0x78
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontDPI\LogPixels - 0x78
Set to huge (192 DPI)
HKLM\Software\Microsoft\Windows NT\CurrentVersion\FontDPI\LogPixels - 0x78
HKLM\System\CurrentControlSet\Hardware Profiles\Current\Software\Fonts\LogPixels - 0x78
HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\Current\Software\Fonts\LogPixels - 0xC0
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontDPI\LogPixels - 0xC0
You'll notice that it seems to first set the default base size, then the specific selected size. Either way, you can ignore the
OriginalDPI entry (which sounds like a logical thing to do), and use these two (together) instead—you said you wanted the "large"
setting, so set them to DWORD 78, and don't forget to reboot:
HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\Current\Software\Fonts\LogPixels
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontDPI\LogPixels
HTH