The gbxmodelimporterv5_4_2max.rar file you have requested: Tools and Utilities / JamesD GBX Model importer - 3.61kb is not available. Perhaps try browsing all files for the game Halo: Combat Evolved and upload any files you want to share or are missing. This is the only information we could locate:
For more information on Halo, visit Halo2.filefront.com This allows you import gbx models for editting and such. Especially useful for weapon creation.