Solution or Workaround
Summary
This error occurs when running the SHAPEARC [shapefile] command:
Unable to open [shapefile]
Cause
The shapefile has possibly been moved, deleted, or renamed.
When a shapefile is created, the original name is embedded in the binary part of the file, and that name is checked by the SHAPEARC command. If the name does not match, the above error message will occur.
Solution
Restore the name of the shapefile and run SHAPEARC again.
Warning:
Never rename a shapefile. If you need to change its name, you must recreate the shapefile using PC ARC/INFO or ArcView.