Open Saved ReflectionIBM.Session using vba

I have a rather simple task that I am trying to achieve but am having trouble. I am trying to open a .rdx file from visual basic. It is run using Reflection. I have tried some methods such as

 Dim Shex As Object
   Set Shex = CreateObject("ReflectionIBM.Session")
   tgtfile = "I:\filepath\Attachmate\123Screen.rd3x"
   Shex.Open (tgtfile)

but can't seem to get it to work and i'm unable to find solutions from other posts.

Please let me know if I can provide anymore information.

Kindest Regards,

Alex