*.shp - Shapefile (stores feature geometry) *.shx - Shapefile (stores file lookup index) *.dbf - Shapefile attribute table file
info/arc.dir - INFO directory manager file info/*.dat - INFO attribute file info/*.nit - INFO table definitions file */*.adf - ARC/INFO coverage data file
ArcView does not support spaces in a file name; so there should be no spaces in any file name related to running extensions. This includes "Shortcut to *.exe".