Amit
Your knowledge of the document standards is limited by your reply here. This issue of the document standards and naming convention was covered by a world body of multinationals and the preservation of all things in human digital text etc. This was to allow anyone, alien or earthly, thousands of years from now, to decode and read and modify the history in the digital world of mankind. So the open document standards were born and ratified and accpeted by the majority of the world that counts. MS did not agree and tried to introduce their own so-called opens standard with the .xml base, i.e.x docx, xlsx, and so forth.
But it has not been accepted by the world bodies, even though the MS document standard does survive. As you will now notice MSO 2007 (partially), MSO 2010 and 2013 all can reads and write in the ODS standard used by OOo, AOO and LO. MS had no choice but to fit in and follow suit, so it's not the other way around that we and all other s outside of the use of MSO, must fit in. The ODS standard is here to stayt and will dominate over time, no matter what the masses say and want. It's about education that we all have choices and many efficient and useful alternatives in the digital world.
Regards
Andrew Brown