The help file reads as follows:
Please note that the uncompressed layout, while storing your application files in a readily accessible state, does not permit you to randomly replace those files. Because of the nature of Windows Installer and the way it handles resiliency, if you wish to update any of the files in the installation package, you will have to rebuild the installation. Simply copying the updated file to the proper location in the build folders may cause your installation to fail.
Does this warning really apply? I tried to make my installation fail several times, i.e. I replaced a very small text file in the "Release" folder with a very large one of the same name, and vice versa. The installation never failed, and the proper file was installed. Is it possible to identify the conditions that can make an installation fail when randomly replacing files?