We have found one software suitable in our database for this conversion.
enc to mxl conversion describes export of Encore musical notations to a compressed variant of the MusicXML format, something that is certainly doable with ENCORE!. If you do not have access to that software, then your options will be always limited, because ENCORE! formats are proprietary, thus not typically supported in open source/free notation tools.
Updated: March 21, 2023
ENC
Files with enc extension can be most notably found as music notations from Encore, an easy-to use score-writing program for Windows and Mac. Notations are text formats that contain the phonographic data of certain song.
MXL
An mxl file extension is related to the Compressed MusicXML notation format used to store music notation. An mxl format is used by ENCORE!, Capella, MuseScore and others.