How to compare conflicts in patch and local file?

We have RTC 4.0.1. when we have patch in pending patch folder and that is in conflict with local file then there is only option to Auto Resolve the conflict. There is no option to manually compare files. In normal scenario when there is conflict that needs to be manually resolved we have an option to compare files in comparator editor in case of patches this is not available.
Could you please assist on this?
 
Regards,
Rhishikesh Patil.