Using Rejig in a batch file

[ADLANCAS]

Hi,

I think about using rejig in a batch file (.bat).
All my encodes are made in this .bat, like this:

"C:\Arquivos de programas\Custom Technology\CCE SP Trial Version\cctspt.exe" -ecl "D:\cce.ecl" -batch

I have not so much knowledges in batch files, but the idea is:
-checks the size of all files *.m2v in drive D:\;
-compare the sum of them to 4000MB;
-resize if greater then x%, to fit 4000MB;

Could someone help to code this batch file ?
Thanks,

Alexandre