The cncmaps_downloader.exe file you have requested: Tools and Utilities / Map Tools / C&C Maps Downloader - 3.53mb is not available. Perhaps try browsing all files for the game C&C3: Tiberium Wars and upload any files you want to share or are missing. This is the only information we could locate:
This nifty tool allows you to browse and download hundreds of maps from C&C Maps! The downloader interface gives you access to the C&C maps database of maps for Generals and C&C3.