Which kind of artifacts can be linked in Doors 9.3?

Hi, from what I understand in Doors 9.3 I can add three type of links:

1.  Standard/Internal links - which can point to internal resources(other objects)
2. External links - links to external resources, files on the file system, URLs
3. Collaboration links - links to other IBM systems like IBM Ratinal Composer ,etc.

But how to attach binary files(zip-s, exe-s, bat files) to an requirement? Does it has to be add on the local drive(where the Doors server runs) or can be on external file store? I can't find way how to do that?