Office / XnView Integration

Is it possible to create a macro or something so that I can integrate XnView into OpenOffice and/or MS Office so that theres simply a button on the toolbar that opens it. Ive got a large collection of clip art and such that I got from the open clip art site as well as heaps of other pics and I think it would be easier having the key word tags in XnView rather than split in the two offices. So if this can be done can someone please explain how. Also taking portability into consideration as well. Thank you