Unzip the map files into a directory of your choosing e.g. Imagic Online/Key Helps. (Macintosh users can use Stuffit Expander or similar to extract the files from the zip)

Key Help has windows with 9(WB) / 8(DoA) corresponding picture files in the Warbirds/DoA directory (Mac users have a Key Helps folder) that can be replaced: 

Warbirds
aircraft.pcx, bomber.pcx, custom.pcx, engine.pcx, gunner.pcx, misc.pcx, radio.pcx, trim.pcx, views.pcx

Dawn of Aces
aircraft.pcx, artillery.pcx, custom.pcx, gunner.pcx, misc.pcx, radio.pcx, views.pcx, zeppelin.pcx

Rename the sim's original files or move them to another folder. 

Make a copy of the map you want to install and rename it to one of the names above then drag it into the relevant folder. The map should then appear under the appropriately named tab in Key Help.

PC users can use the Key Helper utility at http://web.wwa.com/~ty/KeyHelper/ to automate the replacing of map files.

Glars
geocities.com/glarsmaps