Hello Jan,
I have unfortunately no solution either, but I can sympathise since we have been experiencing a load of problems too since upgrading to 1.6. We have not (yet) experienced problems with uploaded word documents in assignments, but we have the same problem as you described when trying to open or download Word documents from the wiki tool. We use Moodle 1.6.4+. (Incidentally, for languages with non-Latin letters (like Dutch or French) MySql 4.1.16 is suggested as minimum.)
The other day we discovered that the conversion of our database was not in fact successful (even though it went smoothly without errors), and that that may be the cause of many of our utf8 related problems. You may want to check whether all MySql database fields (Text and Varchar) have in fact a utf8_unicode_ci collation, or whether any Latin1 collation remains. I have been told that changing that collation now, would severely mess up our database and I am looking for a bright idea on how to deal with this problem.
Rgrds,
Paul.
Assignment
Moodle sometimes corrupts uploaded MS Word files.
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