It seems you should be able to simply resave RNC format to RHP format in Encore.
Convert Encore musical notation file format to Encore file format.
We have found 2 software records in our database eligible for .enc to .rhp file format conversion.
Microsoft Windows software - convert enc to rhp on Windows
Encore is easy-to-use notation score writer application for Microsoft Windows and Mac OS X. Encore is able to create motion picture scores, orchestral arrangements, choir songbooks, or teaching music in school.
Convert from enc file
to rhp file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned enc to rhp. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert enc to rhp on OS X
Encore is notation score writer application for Mac OS X. Encore is able to create motion picture scores, orchestral arrangements, choir songbooks, or teaching music in school.