There is only one file type that uses the .OCD extension:
OCAD Map File
File created by OCAD map creation software; contains a map project and can be used for storing topographical maps, city maps, hiking maps, and other types of maps; can incorporate imported geospatial data to georeference the locations on the map.
OCD files can be exported to a variety of formats, including .PDF, .KML, .KMZ, .GPX, .DXF, .SVG, .TIFF, and .JPG. They may also be exported to an OCAD Internet Map, which stores the map in a published HTML format.
Updated: September 11, 2012