I don't know how well it works. Good for importing 2D pictures or for extruding a terrain from a gray scale image. They are indexed. This file type is my favorite for extruding a terrain or lattice from a grayscale image as I use a Macintosh. .bmp - Bitmap image. Also good for terrain extrusion.
Most files come compressed.
Bandwidth and drive space are limited. To lessen the pain of downloading and uploading, files are compressed. Aladdin Systems makes a PC version of Stuffit Expander called Aladdin Expander . SEAs are Aladdin System's version of the .exe file. On a Mac, just double click to get it to open.