Why we need .rb.swc file

Hi Users,
I am uploading the mavenized FDK to repo. I tried the uploader given in
mavenize.jar but could not make it. Now I am uploading it manually by
selecting pom file and artifacts from each folder. I was able to upload
compiler without any issue but when I tried uploading from advancedgrid
under framework I got an error. This error happens because of two swc file
which have no classifier. Two files are
advancedgrids-4.13.0.20140701.rb.swc and advancedgrids-4.13.0.20140701.swc.

I have added classifier "rb" for advancedgrids-4.13.0.20140701.rb.swc and
uploaded it. I am not sure whether it is correct or not.

Please let me know if I am doing any wrong.

Thanks Regards
Gautam Pandey