This is a post to a blog post from 11/16/20. Please read here first
The Microsoft documentation on Group Policy "Exclude certain file types from uploading" is partly incorrect and incomplete.
The registry key is incorrect
currently no Office formats are supported. I have only tested this with docx, xlsx and pptx. Microsoft has informed me that the documentation will be adapted.
In the wildcard description only the asterisk [*] is described. But also the question mark [?] works.
|In the group policy are stored:||Files||Synchronization|
|*Exclude*.txt||A Exclude Textfile.txt||Blocked|
|A Exclude Textfile.mdb||Synchronized|
|A Exclude Textfile.docx||Synchronized|
Where does this Group Policy work?
This is a computer group policy. Currently, this Group Policy applies to all synchronized areas:
- OneDrive Personal
- OneDrive for Business
- SharePoint document libraries
- Local synchronization of files "shared with me”
- Synchronization of "Add to OneDrive" files
Existing files will still be synchronized. Only new files are scanned.
The user can switch to the browser and upload the file manually. Afterwards, this file will also be synchronized. So it is clear that this Group Policy cannot be used as a security feature!
an exclusion on folder level is not possible.
The user does not (yet) get a display which names and wildcards have been created. He has no possibility to read out these parameters.