Try passing the name of the file to the word executable as the command line. I have Office 2000, and the path for the executable for Word is c:\Program Files\Microsoft Office\Office10\winword.exe. So, to open a file in Word using the Shell command from VB, I used the following line:
Shell """C:\Program Files\Microsoft Office\Office10\WINWORD.EXE"" ""c:\My Documents\MyDocument"""
Pay attention to the quotes. The path for the executable and the path for the document both need to be in quotes, and since I'm passing the command line as a string, I have to have the whole thing in quotes, and use quote-quote everywhere a quotation mark should be in the command line.
Hope this helps!