Getting a PDF File to run from VB6

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Hi guys
Im trying to get a pdf file (I'm using as a help file in an app)
to open up when the help button is clicked.

This is the code i am currently using:

[I]Private Sub DisplayInstructionManual()

Dim AcrobatReader as String
Dim pdfFile as String

AcrobatReader = "C:\Program Files\Adobe\Reader 8.0\Reader\AcroRd32"
pdfFile = "file path here"
Shell AcrobatReader & "" & pdfFile, vbMaximizedFocus

End Sub[/I]

This works all fine on my dev machine, but when i compile an run on other machines it does nothing when i try to run. I have installed acrobat reader on the machines that i want this to work on and the pdf file is located in the appropriate directory. I've also tried using app.path in the pdfFile path but same result. Any help would be greatly appreciated.

Thanks