Is the issue resolved till now?? If not then follow the below.
Not disabling, Its called extending the services of upload, like you can next upload a pdf direct or a jpeg file direct. Try using CSADMIN, OAC0, OACT. In general, for any content repository services, you are to activate that product type by checking as yes in that program. Try search for something called GOS attachment.
If issue is no longer there, then you may close this discussion thread.