OpenType fonts are natively supported on Windows 2000, Windows XP and Mac OS X.
With ATM (Light or Deluxe), you can use them as far back as Windows 98 and Mac OS 8.6.

OpenType fonts can be used on both Macintosh and Windows platforms. They can contain up to 65,000 characters, and may include Western characters as well as non-Western characters, or a wide range of glyphs including ligatures, fractions, old style figures, and small caps.

Below are some older Adobe applications that do not recognize PostScript flavored OpenType fonts and may fail to
include them in their font menus.
* Adobe® Dimensions® 3
* Illustrator® 7 and 8 (versions 9 and 10 work)
* Photoshop® 5.0 (versions 5.5 through 7 all work)
* Adobe® PhotoDeluxe® 1-3
* ImageReady™ 1.0 (version 2 and 3 work)
* Acrobat® 4.00 (version 4.05 and 5 work fine, but text featuring extended OpenType characters may not copy
and paste correctly or be searchable, depending on how the PDF was generated)

Before you purchase any of Fontsmith's OpenType fonts please check the your current software does not need updating. You can find all the latest information at;

http://store.adobe.com/type/browser/OTReadMe.html

Macintosh

Macintosh with PowerPC® processor
Mac OS 8.6 through Mac OS 9.2, or Mac OS X
ATM® Light 4.6 (4.6.2 for Mac OS X Classic)
ATM updater to 4.6.1a/4.6.2a, if using AdobePS 8.8 or later
If using a PostScript® printer, the latest AdobePS printer driver is recommended
16 MB of RAM (32 MB recommended)

NOTE: Mac OS X provides native support for PostScript flavored OpenType fonts (as well as PostScript® Type 1 fonts), and does not require ATM Light for use with native and carbon applications. Applications running in Classic mode in Mac OS X still require ATM Light.

Windows

PC using a Pentium® processor
Microsoft Windows® 95, 98, ME, NT 4 (with Service Pack 4), Windows 2000 or Windows XP
ATM Light 4.1 (not required for Windows 2000 or Windows XP)
If using a PostScript printer on Windows 95/98/ME, AdobePS printer driver 4.3 or later is recommended
If using a PostScript printer on Windows NT4, AdobePS printer driver 5.1.2 or later is recommended
16 MB of RAM (32 MB recommended)

NOTE: Windows 2000 and Windows XP provide native support for PostScript flavored OpenType fonts (as well as PostScript® Type 1 fonts) and do not require ATM Light or the Adobe PS printer driver.

Adobe Type Manager Light ››

AdobePS printer drivers for Macintosh ››

AdobePS printer drivers for Windows ››

StuffIt Expander™ ›› (free utility to decompress downloaded font files before installation)

Click below to download a PDF file of any currently known OpenType issues:

OpenType Issues Mac ››

OpenType Issues Windows ››