Sajha basi mitraharu,
Mero case chainey kasto chha bhanda kheri mero OPT yehi  May ma sakidai chha ra mero employer le yespali Aprila H-1B file gardidai chha. yedi kehi karan le H1B yespali bhayena bhaney ta mero status damadol hunchha, so tesko lagi maile STEM extension pani file garney sochi rha chhu. testo garna milchha ki mildaina hola?? yeso salla sujav ko aasha ma chhu.
आंधीखोले

 Aandhikhole, As far as i know, you can file both at the same time. In your case, if i were you, i would file both. The only thing is you need to spend the filing fees in OPT extension. Once, your H1B petition is approved, OPT extension card will be automatically discarded.  Last year, i had the same problem. Also you can visit, subscribe and ask your question in www.redbus2us.com. Those indians will answer your every questions. 

 Thanks beerguy! Much appreciated.