For clients using Office Suite, some file types may not appear in their Office Suite application if they are using an older version of TeamConnect, and if they do not have certain document types.
In order to add different different document types to an older TeamConnect instance, first navigate to Setup -> Document object -> Document Types to get a list of current types on TC.
Then navigate to Document Types in an instance of the most recent TC version, and copy/paste all missing document types over to the older instance.
After the document types have been added, you need to restart the instance in order for the changes to take effect. Once the instance is restarted, you should now be able to see those missing file types in Office Suite.