Found a solution thank to the kind person who made the file converter to .map files in this thread CNCNET Custom Maps automatically rendered issue - Red Alert 2 - CnCNet Community Forums
Does anyone have the Yuri Colossus map ( Red Alert 2 - Colossus Map - 7 vs 1 - YouTube ) in the { .map plus PNG } files version so it can be played on CnCNETYRLauncher ? I have the t2mp5_1yrm file version but it will not accept it for that platform.