http://www.es-geo.com/download/Addin..._ER_Mapper.doc
About EPS Files
Encapsulated Postscript (EPS) files can be vector (line art), raster (image) or a combination. Vector files are preferred because they can be scaled to any print size and will always be rendered with clean lines and edges. Raster files are more common, but can look pixelated if the image is printed at a large size. Following are some guidelines for creating the EPS file for your logo you need to start with:
Vector (line art) files–These files typically are created in vector drawing programs such as Adobe Illustrator, Corel Draw or AutoCAD. To create the EPS file, export or save the logo as an Encapsulated Postscript file in your drawing product, or use a program to convert it from another format such as CDR, DWG, etc. to EPS. Note that some programs create variations of EPS files that ER Mapper does not support, so make the EPS as generic as possible. Make sure your EPS file has a “.eps” file extension.
I got the above from here
I'll attach an EPS version of the autocad file. (it won't let me attach the file with an EPS extension so I zipped it first)