the question might be "Which kind of Office Document?"
let me just write a few sentences abou the MS-Word documents...

You should reference the Microsoft Word TypeLib to your project. (at this
point you may wish to look for the tlbimp.exe)
If you are using Visual Studio, there is nothing to worry about, anyway,
referencing the typelib to your project is not the solution itself...

you should then create the application then open the document on this
reference,
I can not remember the exact function parameters now but it should be
something like:

Dim oApp As New Word.Application
Dim oDoc as Word.Document

oDoc = oApp.Documents.Open([FILE_PATH], ....... )
oApp.Visible = True ///just to c the app working
.
.
.
.

Murat

Check for the Open method's parameters