In our msi, i want to set the targetdir to a default value, and allow the user 
to override it if a property value is passed in. The setup has no UI, and the 
user can set a property through command line to override the install location. 
How can I override the targetdir only if it is passed in through command line?
 
I was thinking of setting a custom property and check if the property is 
present and if not, set targetdir to default value. If it is present, then to 
use a custom action to set the target dir. Is there some other easier way of 
doing it?
 
Thanks
Ravi
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