LVZ
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Mine GO BOOM says:
Source: http://www.shanky.com/server/faq/buildlevel.html#1005411851
A .lvz file is a compressed file that the server sends to each and every client. When the client receives the file, the client will extract the data inside of it to either the zone's main folder (\Zones\Zone Name Here\) or a subfolder named that arena name (\Zones\Zone Name\ArenaName\). The client will then use any .bm2's, .wa2's, etc, to customize the client for that arena.
The .lvz's can also do special 'objects' that the client can see via the command *objon and *objoff (read FAQs on them for more help). These objects can do various things, such as place images on the screen, or put text at certain locations giving the client hints in a maze.