I have the following code in Click event of a button

lcDocument = "pcbOil.doc"
ThisForm.Printdoc(lcDocument)

The custom method PrintDoc on my form is as follows:

PARAMETERS lcDocument
oWord = CreateObject("Word.Application")
oDoc = oWord.Documents.Open(lcDocument)
oDoc.PrintOut()

At the startup of my app, I establish the path in my Setup.prg file as follows:
SET PATH TO &gcPath

gcPath is assigned a value earlier of h:\labtemp;h:\upsi;h:\labnav

How do I make the line:

oDoc = oWord.Documents.Open(lcDocument)

properly search a subfolder beneath the folder h:\labnav named \letters for the file pcbOil.doc.

Thank You