Can this be done more efficiently?

' Routine moves data from text file into excel spreadsheet cells
buildsheet:
RowNdx = 3
Open MTOFile For Input Access Read As #1
While Not EOF(1)
Line Input #1, WholeLine
If Right(WholeLine, 1) < Sep Then
WholeLine = WholeLine & Sep
End If
ColNdx = 1
Pos = 1
NextPos = InStr(Pos, WholeLine, Sep)
While NextPos = 1
TempVal = Mid(WholeLine, Pos, NextPos - Pos)
Cells(RowNdx, ColNdx).Value = TempVal
Pos = NextPos + 1
ColNdx = ColNdx + 1
NextPos = InStr(Pos, WholeLine, Sep)
Wend
RowNdx = RowNdx + 1
Wend
Close #1
Return