Fonts that are Protected by Windows File Protection
Windows File Protection is a feature of Windows XP that prevents the unauthorized replacement of essential system files. WFP runs as a background process on Windows XP and monitors certain files. When WFP detects that a protected file has been changed, it restores the original.
Protected files include the following files that ship on the Windows XP product CD:
•	Micross.ttf
•	Tahoma.ttf
•	Tahomabd.ttf
•	Dosapp.fon
•	Fixedsys.fon
•	Modern.fon
•	Script.fon
•	Vgaoem.fon
If the application requires newer versions of these components, it must update these components by using a Microsoft Service Pack that installs the required versions.
http://www.styopkin.com/articles/protected_fonts.html
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