Thumbnails for Windchill Documents

I have the following problem:

If i create a document in windchill i can attach primary content as well as attachments. What i would like to have is a thumbnail for this document.

My problem is:

The only way that i can see to create a thumbnail is by publishing the document which creates a representation and a thumbnail for that representation. But this is exactly not what i want to have. If you click on the thumbnail the representation will be shown and not the primary content file and also not the attachment -- Additionally the representation is stored as an additional File aside the primary content

I simply want to to have a thumbnail which opens creo view showing the primary content and the attachments ( This works very well as long there is no representation attached to the document.)

Please tell me your experiences

Regards

Herbert