My map EXE files are Zip Self-extracting zipfiles...
For the below process to work, make sure not to select SAVE to disk...

When you select  OPEN  or  Run, download begins, then when download is
done a dialog box will appear, select OK to extract and send the map
to   "C:\Program Files\Pumpkin Studios\Warzone2100".

Thats it, Now your ready to play!

NOTE:
The above (default) Warzone2100 folder applys to US and other versions.
I use the latest Nortons AntiVirus to ensure of no virus risk.
I just wanted to make it easy for people to automatically let the
self-extracting EXE send the map to the default Warzone2100 folder 
since most people cant seem to do it manually with the zip format.

Zip formats are located back where you started (in a Pull Down Menu)