Opening files after installation

[iomike]

As a newbie to SF7 forgive me if this simple question has been answered before. I have no problem building my installation but I want to give the user the option of viewing one of two .pdf files after installation. I have added 2 radio buttons to the "After Installation" screen and inserted the following code into the "On Next" actions: -

fAppFolder = SessionVar.Expand("%AppFolder%")
nSelControl = SessionVar.Expand("%RadioSelection%")

if nSelControl == CTRL_RADIO_BUTTON_01 then
File.Open(fAppFolder.."\\File1.pdf", "", SW_SHOWNORMAL)
elseif nSelControl == CTRL_RADIO_BUTTON_02 then
File.Open(fAppFolder.."\\File2.pdf", "", SW_SHOWNORMAL)
end

Irrespective of which button is selected neither of the "if" statements is ever true and neither file is opened. I have tried tracing the code but even if nSelControl is the same value as one of the buttons the file is still not opened, any ideas?

[iomike]

Just noticed the line in the help that tells me that I need to convert the string to a number before comparison! But Debug.SetTraceMode shows the value as a number anyway, there is no indication that it's a string!