You can not slipstream SP1 to Compatibility Pack. Just add to chain install first Compatibility Pack and then SP1 for it. Silent switch is switch which will allow you to install some software without user input, silently. When adding Compatibility Pack and SP1 for a switch choose "Custom" and the enter this: /quiet Cheers I tried to chain fileformatsconverter.exe abd then clicked on add but it didnt add itself,,,.. any reasons?? Even no report on log windows panel added for not insertinf/adding file!!