It seems the natural choice for a cvs to cnv conversion would be to re.save various versions of Canvas drawing. The latest versions of Canvas should still be able to open the old .cvs just fine and able to save them in he newer .cnv file.
Convert Canvas bitmap or vector image to Canvas drawing.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert cvs to cnv on Windows
A drawing software used to create technical illustrations and graphics
Convert from cvs file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.