How can i change the projection system in WEAP?

My problem is when i add raster layer , i see it in preview but it doesn't visualized in the area after selecting "OK"

To use any raster image file in WEAP as a background on the map, you need a "world" file that georeferences the image. If you don't have a world file for your image, you can create one in any GIS package, such as ArcGIS. For a TIFF file, the world file would be the same name but with ".tfw" as the extension. For a .jpg file, it would have a .jgw extension)

To see an example, look in the _Maps\Tutorial subdirectory (within the WEAP Areas path) for the files Map.jpg and Map.jgw. These are used in the Tutorial, version "Data, Results and Formatting".

For more information about loading raster layers and about projections for vector layers, see http://www.weap21.org/index.asp?action=9&read=2385&fID=30