The d3refrag.zip file you have requested: Maps Levels Missions / Multiplayer / Q to R Titles / D3Refrag - 3.99mb is not available. Perhaps try browsing all files for the game Doom III and upload any files you want to share or are missing. This is the only information we could locate:
This is a training map designed to test out your basic and advanced jumping abilities (strafe jumps, spinning jumps etc). Not so easy unless you have played similar maps on Quake 3.