The first thing to consider is that under unwanted programs you do not exclude by filemane because it does not work like that and the exclusions must be done by detection name. As you said that you have excluded the R_Server.exe I think that you have done the exclusion under the USer Defined Detection. Doing that what you doing is forcing that file to be detected as a virus and of course it will be deleted.
I advise to remove the exclusion R_Server.exe and from User Defined Detection and your issue will be solved
Please, let me know if you have any question.