Several, completely different, enc file types exist, but it is very well possible that at least one of them can be exported / converted to PDF format. This is usually the case for various text and document files, but for example music notations from Encore (.enc files) can also be exported PDF documents.
Be careful when dealing with .enc files as some are generated by ransomware. If that's your case, you will have to look for a decrypter for your particular infection of ransomware. There is no way how to otherwise convert this type of enc files, you can only recover them - if you are lucky.Open ENC file Open PDF file
A notation score writer application