Need to be clear on terminology here. A Word document is not a 'text file'
for programming purposes.

There's no easy way to parse a Word document line-by-line unless each line
ends with a paragraph mark -- in whcih case your 'lines' are actually
paragraphs:

Dim pPar as Word.Paragraph
Dim pWord as Word.Range

For each pPar in ActiveDocument.Paragraphs
   ...
   For each pWord in pPar.Words
       ...
   Next
Next

OK, provided that your file really is a text file, the following
demonstrates how to parse it and how to use the resulting array.

Dim vText As Variant
Dim vArray() As Variant
Dim i As Long
Dim j As Long

Open "C:\My Documents\testfile.txt" For Input As #1
vText = Input(LOF(1), #1)
vText = Split(vText, vbCrLf)
ReDim vArray(UBound(vText))
For i = 0 To UBound(vText)
 Debug.Print vText(i)
 vArray(i) = Split(CStr(vText(i)), vbTab)
Next i

For i = 0 To UBound(vText)
 For j = 0 To UBound(vArray(i))
   Debug.Print i; j; vArray(i)(j)
 Next j
Next i

This will work for any version of Word from Word 2000 onwards. Word 97 lacks
the Split command.