Hi,

You can set the path dynamically in the code behind of the web part according to current document.

But easier would be to set the path e.g. to be /% and then use just "Document types" property, where you will specify the document types which should be listed. So in this case the repeater will go through the whole content tree but only documents of certain type(s) will be displayed, as you need to.

Best regards,
Juraj Ondrus