HelenOS sources

CKID_gmtr         357 uspace/lib/gfxfont/src/glyph.c 	rc = riff_rchunk_match(parent, CKID_gmtr, &mtrck);
CKID_gmtr         388 uspace/lib/gfxfont/src/glyph.c 	rc = riff_wchunk_start(riffw, CKID_gmtr, &mtrck);
HelenOS homepage, sources at GitHub