Default [Q] corrupted 3ga file voice recorder

hello all.

Would greatly appretiate your help,
there is no answer for this question so i ask :
Problem:
I have a corrupted 3ga file extension, created by voice recorder app (build in app is S2) and corrupted due to sudden crash.
Solutions already explored and FAILED :
1.Change extension to mp3
2.file repair freeware program.

the file is 13MB, and to my understading missing a proper header of some kind to make it a proper 3ga file.

Thanks and take care
citizenX