My zone viewer reads wld files (zone geometry) just fine and is written in C++. For zone geometry you really only need three or four types of fragments (0x21, 0x22 and 0x36 if my memory serves me right), though texture info might be handy as well (for zone borders and other transparent stuff), but the 0x31,0x30,0x05,0x04 and 0x03 fragments are reeeaaally easy to read.
Not sure though if it's fast enough for a zone bootup (loading times need to be fairly short).
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