There is only one file type that uses the .OV2 extension:
TomTom Points of Interest Database
Database of locations called "points of interest" that can be overlaid on a TomTom navigation map; may be created manually with TomTom Navigator (using a Pocket PC device) or by converting an existing database to the TomTom Navigator format with TomTom HOME.
OV2 files may be saved with a corresponding .BMP image file that provides a graphic representation of the locations.
Updated: June 16, 2018