Some tools and wizards return this message when trying to access a dataset:
"Warning: Invalid entry. Spaces are not permitted in path name."
Some of the tools and wizards will run but one of these execution errors messages will be produced:
"Too many arguments entered"
"Keyword token expected"
ArcInfo Workstation commands for working with coverages, GRIDs, TINs, shapefiles, or dBASE tables don't support paths names that contain space characters. Since these commands are used by many ArcGIS tools, this limitation applies to them as well.