If a new version of Encore is in the works, it should be able to import files created in ALL previous versions of the software, including Encore 4, Encore 4, Encore 5, Musictime DeLuxe 3, Musictime DeLuxe 3.5, etc. When one has hundreds of scores created in these software packages, a new version of the software that doesn’t recognize them is NOT an “upgrade”.
If it is too involved to integrate this backward compatibility in the Encore software itself, then a separate stand-alone program needs to be available, that can translate any of these older versions into the latest version of Encore.
Asking people to abandon years of past work is probably not good for future sales.
My $0.02