Copy the *.BGM, *.OVM, *.MMM, *.RFM & *.LOS files for all the maps in the CC5/Maps folder to CC3/Maps. Unzip the new Map.txt files in the CC5to3.zip to CC3/Maps. Open the CC3 scenario editor, create a scenario for the CC5 map[s] and play. 

NOTE: several of the larger CC5 maps may not work in CC3. I suspect this is due to their having a 'portrait' aspect [height bigger than width] at an image size close to the CC3 map size limit [625 megatiles/3000x3000 pixels].

txtfiles.exe tool used for these conversions written by Tirpitz b-m.lideus@swipnet.se
based on the terrain ELEMENT conversion values determined by NL_Oxcart NWP_Oxcart@yahoo.com

report any map terrain anomalies you spot to the CC.TGN editing forum
http://www.sonic.net/cgi-bin/lairross/forums/editing/index.cgi

enjoy

mick (xe5)
mcconmy@earthlink.net