There is a recently-discovered bug in NCPT (version 2.01 only, which is the version that shipped with NMIT 4.0) where Forward Lock files are created missing the final CR LF after the last MIME boundary string. This bug causes these Forward Lock files to be unreadable on phones that support DRM.
The workaround is to edit the Forward Lock file (with HexEdit, for example) and append the file with CR LF characters before sending the file to the phone.
The next version of NCPT (version 2.1), will be available shortly and will fix this problem.
We apologize for any confusion or inconvenience this bug may have caused.