Custom Action Failing

Hi,

I am using a custom action to run the unwise installer but it keeps failing,

I am using Execute from path

I have entered the following:
property: %comspec
command line: /c c:\program files\sybase\olbooks\unwise.exe /s c:\program
files\sybase\olbooks\install.log

(I am using normal execute immediate/deffered and running just before
install finalize)

I also tried running as a batch file and entered following:
property: %comspec
command line: uninstall.bat

uninstall.bat = c:\program files\sybase\olbooks\unwise.exe /s c:\program
files\sybase\olbooks\install.log
The CA shell's out but the batch file fails to run

If I change the batch file so uninstall.bat = echo c:\program
files\sybase\olbooks\unwise.exe /s c:\program
files\sybase\olbooks\install.log > c:\uninst.bat, the batch file runs fine,
if I then run c:\uninst.bat that the CA created the uninstall works fine??

I can't understand whats wrong as I always use similar CA's without
trouble...

Regards,
Tony