The AutoCAD Plant 3D Spec Editor file formats:
- AutoCAD Plant 3D Spec Files (*.pspx, *.pspc). PSPX and PSPC files are a pair, and must be copied and managed together. You cannot rename spec files.
- AutoCAD Plant 3D Catalog File (*.pcat). PCAT files contain catalog part information.
- Auxiliary Catalog File (*.acat). ACAT files contain catalog parts that support AutoCAD Plant 3D but are not added to a spec. For example, equipment nozzles, and pipe supports.
When you work in the editor, the changes you make are not immediately saved. To commit changes, you save the file. If you want to undo changes, you can close the spec sheet without saving.