This "conversion" actually represents standard workflow in Mixcraft, i.e. creating a template (.mx5template) from actual audio project (.mx5). Both files are from version 5 of Mixcraft, so it is unlikely you can use it in any other version, especially lower ones.
Convert Mixcraft 5 audio project to Mixcraft audio project template file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert mx5 to mx5template on Windows
A multi-track recording software.
Convert from mx5 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.