Can I use TrueType font files from Windows on the Macintosh or vice versa? Do I need a conversion or font designer program to do this?

The Windows version of TrueType fonts contain additional tables not found in the Mac OS version of TrueType fonts. There are a couple of applications that allow you to convert TrueType fonts from Windows fonts to Mac OS fonts, and from Mac OS to Windows TrueType fonts. You should check with Macromedia for information about Fontographer, a complete font designer application.

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