Got it to work as it follows :
del "D:\YOURPATH\OpenBOR\Paks\*" /Q
copy %1 "D:\YOURPATH\OpenBOR\Paks\
OpenBOR.exe
exit
Basically what it does is to clear the pak directory and copy the .pak file game to the folder so it can be executed . It is made this way because OpenBOR only reads the first .pak file of the D:\YOURPATH\OpenBOR\Paks\ directory,