Files with uko file extension might be found as GIS data files in UK Offshore Operators Association (OKOOA) P1/90 data format.
UKO file extension - UK Offshore Operators Association (OKOOA) P1/90 data
What is uko file? How to open uko files?
File type specification:
The uko file extension is mainly related to UK Offshore Operators Association (OKOOA) P1/90 Data format. Some sort of older 3D/GIS format.
Most likely some old format without support. No further information could be found.