"MVS" to "WAV"

I converted "Msv" to "wav" format.

and write a code to get the size of data from wav file.

code :

MyFile->Seek(40,soFromBeginning);

MyFile->Read(&SizeOfData,sizeof(DWORD));

the size of SizeOfData return is very large.

I use same method for other wave files is no problem.

Any suggestion.