MIME-Type recognition is sometimes wrong!
I analysed MIME-Type recognition and found that MIME-Type recognition is not working proper. As example, DOCX-files are recognized as "application/msword". The right MIME-Type of DOCX-files is "application/vnd.openxmlformats-officedocument.wordprocessingml.document".
I already opened a support case with request number 03058060 and got this answer:
"Yes, the MIME recognization from XG for .docx is under applications/msword"
So please change MIME-Type recognition, that it serves the MIME-Types, which are listed here:
We can confirm this issue