There is only one file type that uses the .OC5 extension:
openCanvas 5 Event File
File created by openCanvas 5, a free drawing program that allows recording and playback of drawing strokes; saves the stroke events used to create a drawing so that it can be automatically redrawn again in the software.
NOTE: openCanvas uses .OCI files to save images created in the software.
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Updated: December 21, 2012