bhavirisetty,
Sorry that you are seeing this issue. I could not replicate the issue at my end. I could add the zip as source attachment to a jar file.
Can you please answer some more questions for us?
1. Can you share the Installation Details from MyEclipse > Installation Summary > Installation Details ? Paste them here for us.
2. Are you trying to add the source to a jar file? What is the exact error you are seeing ? Please elaborate the steps you are following in detail.
3. Clear the contents of the .log file which is located at <workspace dir>/.metadata/.log , replicate the issue and copy paste the contents of the .log file here for us.