Axure rp 9 Cannot open file I created with Axure rp 10

Hello, I created a prototype with axure rp 10, which I intend to share with my colleague who uses axure rp 9. But he could not open the .rp file. Is there a wayof making rp10 file compatible with rp9?
we both uses window systems

Nope. All Axure RP versions are backwards compatible but not forwards compatible. I think the only solution would be for you to rebuild the prototype in RP9.

You could try to send an email request for this to support@axure.com. I honestly wouldn’t expect more than a recitation of their application requirements and constraints, but you never know.

Thanks,yeah that’s kinda suck