Execute batch file

I need to run a batch file with an argument before uninstalling. I am executing the batch file correctly but the arguments aren't passing. What I am currently doing is in the controlscript.qs is: 

 
installer.execute(targetDirect + "/before_uninstall.bat", [installer.value("ProductVersion")]);   
 
and in the batch file:
 
set RELEASE_VERSION=$1
 
I have the same logic in my installscript calling another script:
 
component.addElevatedOperation("Execute", "@TargetDir@/after_install.bat", installer.value("ProductVersion"));
 
And there it works well. What is happening? I have searched the documentation and I have also tried new Array(installer.value("ProductVersion")) but stilll doesn't work.