LDraw files (LDR, DAT):

application/x-ldraw

Multi-part LDraw files (MPD):

application/x-multi-part-ldraw

LDLite files:

application/x-ldlite

The web server munin.nbi.dk, which formerly hosted LDraw.org was configured by adding:

    AddType application/x-ldraw            dat
    AddType application/x-multi-part-ldraw mpd
    AddType application/x-ldlite           ldlite

to the file /etc/httpd/conf/httpd.conf (it's Apache). Most people prefer to use three letter extensions, so the LDLite line should probably read:

    AddType application/x-ldlite           ldl

For questions, contact Jacob Sparre Andersen