Extension Description Author File / Link
iso ISO/IEC 13818 MPEG 2 Format (9 parts) Deprecated resource Link
ISO/IEC 11172 MPEG 1 Format (5 parts) Deprecated resource Link
iss FunCom ISS Audio File Format (.ISS, .XARC) Valery V. Anisimovsky Download
it Impulse Tracker File Format v2.14 Jeffery Lim Deprecated resource Download
Impulse Tracker Site Deprecated resource Link