The guimissionbuilder021.zip file you have requested: The Outdated Abyss / GUI Mission Builder - 2.2mb is not available. Perhaps try browsing all files for the game Star Trek: Bridge Commander and upload any files you want to share or are missing. This is the only information we could locate:
This is an excelent beta tool for building missions. If you are good at scripting, this is good to have. They need testers to help work out bugs. Make sure to fallow all instructions in the readme.