What do you want to do with the support files? In some cases, using the Binary table might be more appropriate; in any case, the InstallShield help topic "SUPPORTDIR" (and the topics it links to) should help you get started.
I have basic MSI project. I have included DLL file to the Support Files section (later, during install, I want to call funtions from this DLL via Custom Action).
Help say, that all support files are extracted to the folder, denoted by SUPPORTDIR variable. But in reality, I found my DLL in the TEMP \ {PRODUCT_GUID}, while SUPPORTDIR poits to another folder.
I tried to access SUPPORTDIR via MsiGetProperty, but it returns empty string.
What does your MsiGetProperty call look like? What is the return code? A common issue is forgetting to set the buffer-size variable to a large enough number to hold the property value before calling MsiGetProperty...
It starts working! Do not know, what was a reason of prev problem, maybe I made a mistake in property name, passed to MsiGet....(). The buffer was initially 1024, now I've made it to be 8192. It works fine.
