Thank you very much Carl for your reply and patience. Yes, I am a bit more inclined to LotusScript rather than Java.
Thanks for that link of code in Java agent & LS too. I modified my code and it works. So, IT IS possible to read an attachment in LS without extracting it.
Also, I came across other ways using DXL and even NotesDOMparser.
I am sure others will find these helpful when they want to read an attachment without extracting it.