Rob and Dacian, Thanks so much for your help.
> 2) How do I sequence the CA so it executes before my UI is displayed? Rob: I'd sequence it straight after AppSearch. Dacian: Put it under InstallUISequence Yes. Perfect. <InstallUISequence> <Custom Action="MyAssign" After="AppSearch">NOT MY_REAL_VALUE</Custom> </InstallUISequence> I also kept it in InstallExecuteSequence in case of silent installs. 3) How do I condition the CA to only execute if MY_REAL_VALUE is empty? Rob: Try a condition of NOT MY_REAL_VALUE. Dacian: NOT MY_REAL_VALUE Thanks. For some reason, I had it in my head that I needed [MY_REAL_VALUE] (which gives errors at build time). Thanks again for the help. Dale ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ WiX-users mailing list WiX-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wix-users