There is only one file type that uses the .OC4 extension:
openCanvas 4 Event File
File created by openCanvas, a drawing application that allows playback of drawing events; saves the series of stroke events that were used to create the image; can be played back in the software to see how the image was drawn.
NOTE: Other openCanvas versions use .OC3 (version 3) and .OC5 (version 5) files for events.
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Updated: August 21, 2012