IRTP file extension is for Graphics Graphicon-2000 Interactive Real-Time PHIGS
Similar to IRTP
8CM - 8 Channel Module Music8M - Math 8 extended character set printer font PageMaker
8MED - Amiga OctaMed Music file
8SVX - Amiga 8-bit Sound format
8U - Roman 8 extended character set printer font PageMaker
91 - 91x91 dpi display font Ventura Publisher
96 - 96x96 dpi display font Ventura Publisher
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