What is this SPAN file?

how to open this SPAN file? In windows PC which application has to install to view this?
if not then what information it has ?


If you don’t know what’s that. Better stay away from that file & read this for your knowledge

I know what is the SPAN margin. There is begin day SPAN ® file ,1st Intra-day SPAN ® file, 2nd Intra-day SPAN ® file,…End of day SPAN ® file etc., but span margin is excpected to change at the end of day then why this 1st, 2nd 3rd…?
and i am asking, why this files are in .spn format ? when others are in excel !!

how do you know its better? did you open that file before? what did you found?

Don’t know if you found answer to your query, but I believe this link on NSE website - https://www.nseindia.com/products/content/derivatives/equities/pc_span.htm should give the info. you looking for.