I got it! The Installshield help was quite good. I should have looked there first.:D I had 2 native MSI's, and created MST's for both of them, plus modified the MSI's a bit to remove some shorcuts and add a few files. I then merged the MST's into the MSI's. Then I created a custom action in one of the MSI's to launch the second MSI, and put that MSI file into the first one. So now I have one MSI to install both programs with the customizations! Hehe, it was kind of fun.:cool: