I am exporting gedcom files from the latest version of Family Historian in gedcom 5.5.1 format using various formats; ANSI, UTF-8, UTF-16, and Unicode. They all fail to produce a Gedcompare file yet if I look at the "Raw" data, there is clearly gedcom information in the file.
I am not finding advice for what WikiTree is looking for in terms of gedcom versions an formats. Surely it has to be buried somewhere in the myriad documents.