Hello,
On the basis of my findings I assume that RPTX is a Pdf file created using a third party control. Hence, the same cannot be loaded in AR7.
However, if it can be converted to something else (e.g. an image), then you can create a report in AR7 and use this image in it.
Let me know if I mis-understood your query. Also, please elaborate a bit more on your requirements and the expected behavior.
Regards,
Mohita