@brady.miller Thank you, that helps me see that these MIME types are blacklisted.
Additionally I see that on server A this is not switched on, where as it is on server B:
Administration > Globals > Security > Secure Upload Files with White List
Is the default with OpenEMR 5.0.2 to block file formats that can potentially contain malware (e.g. .doc and .docx)? If so, what have people standardised on doing – exporting Word documents to PDF for uploading into OpenEMR?
@RachelEllison yes the docx came from LibreOffice.