How to install a font without logging off or rebooting a PC?

Question

Is there a way or an API to install a font on the PC for every user, without logging off or restarting the PC?

Answer 1

See the MSDN document, Font Installation and Deletion, for full details. In summary:

• Copy the font file to the fonts directory (%windir%\fonts).
• Call AddFontResource() to ensure the font is immediately available.
• Broadcast the WM_FONTCHANGE message.

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Thanks to @Alex K for cleaning this up and adding the fine detail.