This conversion seems to mainly represent a transformation of music notations from compressed MusicXML format (.mxl) to Encore notation format (.enc). Except for the ENCORE! software itself, there may be other 3rd party alternatives for this particular music notation conversion.
Convert Compressed MusicXML music notation file to Encore musical notation file format.
We have found 2 software records in our database eligible for .mxl to .enc file format conversion.
Microsoft Windows software - convert mxl to enc on Windows
A notation score writer application
Convert from mxl file format
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 mxl to enc. 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 mxl to enc on OS X
A notation scores writer and music composing software for Mac