Hi Pieter,
Please make sure you select an Inventor-file (such as ipt,iam, idw and so on)to execute Check In command in Vault Browser.
If you select *.ipj or non-Inventor file (attachment of Inventor file, doc, bmp, xls...) and Check In, in Check In dialog click "Settings" button, you will see the "DWF Attachment Options" are not available.
Inventor does not support publish DWF file for *.ipj and non-Inventor files.
Thanks,
Tony
Message was edited by: Tony.Feng