If you added the file to the Support Files / Billboards section of the project, you can link to it in your project and, in particular, OnBegin.
For example, if you have a foo.exe file that you need to execute, you can add it to the project as a support file and a link using the SUPPORTDIR keyword. It will look something like this:
LaunchAppAndWait(SUPPORTDIR ^ foo.exe);
source
share