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OpenType is a relatively new font format developed jointly by Microsoft and Adobe. Its advantages over PostScript include cross-platform compatibility—the same font file will work on a Mac or Windows computer—and multiple language support. Application support for OpenType is expanding, however it is still not universal.

Minimum System Requirements

Macintosh

Macintosh with PowerPC® processor
Mac OS X
If using a PostScript® printer, the latest AdobePS printer driver is recommended
16 MB or more RAM

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 or more RAM

The above is what the Process Type Foundry supports. For more details, visit Adobe’s OpenType requirements page

Software Requirements for OpenType (Featured)
To take advantage of the features beyond the standard character sets in our Klavika, Lingua, FindReplace and Maple fonts, you will need a program that supports OpenType features. As of this date the following programs support OpenType features:
Adobe InDesign 1.5 and higher
Adobe Photoshop 6 and higher
Adobe Illustrator CS
QuarkXPress 7

Known Incompatibilities
The following applications will fail to properly show PostScript (CFF) flavored OpenType fonts.
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)

For more on this view the Adobe compatibility issues

Learn More About OpenType
An introduction by Adobe
OpenType Q and A from Adobe