how to use ".map" and ".mmx" files?

[OsamaHelmy]

Hello, I downloaded many maps, some of the files are .mpr extension which works fine, but some are .map and .mmx which they don't appear in the map list inside the game

how to use these files?

[McPwny]

.mpr is the native file extension of red alert 2 maps. when YR came out, the map extension for the expansion changed to .yrm to distinguish between expansion and non-expansion maps.

cncnet reads .map file extension, which is quite literally just .yrm or .mpr maps with their file extension changed to .map for i suppose compatibility reasons. so if you are using cncnet to play the maps, change the extension to .map and put it in your custom maps folder. if you are using vanilla yr, then make sure the extension is .yrm and put it in your game folder. likewise if its vanilla non-yr RA2, it will read only .mpr

i forget what .mmx was. i think it was just an arcane alt version of .mpr