The the_long_run.mpr file you have requested: Maps Levels Missions / Mission Maps / Tiberian Sun / The Long Run - 293.46kb is not available. Perhaps try browsing all files for the game C&C: Tiberian Sun and upload any files you want to share or are missing. This is the only information we could locate:
Simply put the file into your SUN folder. Here's another great map for Tiberium Sun! This is a 1 v. 1 map, intended for Skirmish use.