| .MAP | The main input file for MapComp. |
| .EWM | The output file for use by EWView/DOS. EWView/DOS only reads files with this name extension so its use is almost invariably required. |
| .LNS | Input file containing line segments, including arcs and other constructs. |
| .TPS | Input file containing turn point names and positions. Files containing other named points (e.g., airfields, towns, nav aids) have the same format but use of a different name extension would be appropriate. |