H1B approved, can I still file OPT extension

Hi, my H1b case got approved, I am currently on my Initial OPT, Will I still be able to apply for OPT-Extension?

if your H1B was not filed as Change of Status, you maybe able to use the STEM OPT extension. Check with your Attorney and DSO.

Thanks for the response. Is ther any other way to know whether it has filed under ‘change in status’ or not. As in is this information anywhere mentioned in the LCA or I-129?

It will be in I-129 form. If you have a copy of what was filed, you can see it in Part 2 section.