Since you used WF4 with TXML file it converts them into WF4 format TXLF. What you need to do is go to File menu in Editor and use Save as Translated option. If you are on Project Files menu use Cleanup option to generate TXML file.
TXML file is used by Wordfast Pro 3.
Hope this helps.
I am a new user of Wordfast pro 4, I used it to do the translation from client (.idml.txml), however, when I am trying to save the file it became .txlf, which is not recognised by the system.
Is there any way I can do to convert the file?