All IB Type fonts are available in desktop and webfont format.
IB Type webfonts (EOT, SVG, TTF and WOFF) are delivered as compressed .zip files for self-hosting.
IB Type desktop fonts are released in OpenType format. OpenType is compatible with Mac OS-X and Windows 2000 (or more recent versions).
Fonts that you purchase and download from IB Type are delivered as compressed .zip archives. You'll need to expand these files before you can install the fonts.