It seems the only way to convert .prv files to .pvs files would be to use standard working procedure in SoftMaker Presentations and use the template (.prv) to make a presentation document (.prs). Likely, this can only be done in the default program and in no other 3rd party software.
Convert SoftMaker Presentations presentation template file to SoftMaker Presentations document file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert prv to prs on Windows
SoftMaker Presentations is a powerful graphic presentation program with many features capable of work with many present standard presentation formats. SoftMaker Presentations is also licensed to other office suites, such as Ashampoo Office.
Convert from prv file
to prs file
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.