Hi,
I don't think that the option in Ancestris is to select a FTW file.
Normally, the import work with a GEDCOM file generated by Family Tree Maker.
Google translate follow :
Jeg tror ikke, at muligheden i Ancestris er at vælge en FTW-fil.
Normalt arbejder importen med en GEDCOM-fil genereret af Family Tree Maker.
Zurga