How to delete the undeletable file from micro sd card

[bidit]

Hello,
i am using sony anio mobile, there is one file i.e 3gp file which can't delete from my micro SD memory card. how can i delete this file

 

[buwish]

Have you attempted to simply format the card? There should be a means to doing so somewhere within the options menu.

 

[derekKinny]

www.tooLongPath.com saved me lot of time for solving this problem