The cracks.mpr file you have requested: Maps Levels Missions / Mission Maps / Tiberian Sun / Cracks in the Sand - 187.26kb 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:
Here's a map for Standard Tiberian Sun, which is not only a good map, but was also an entry in The Great Mapping Competition, which was a contest between some of the best and brightest mappers for Tiberian Sun. Here's a map for Standard Tiberian Sun.