try this
Workbooks.Open Filename:=Filename, Format:=2
Format Optional Variant. If Microsoft Excel is opening a text file, this
argument specifies the delimiter character, as shown in the following table.
If this argument is omitted, the current delimiter is used.
Value Delimiter
1 Tabs
2 Commas
3 Spaces
4 Semicolons
5 Nothing
6 Custom character (see the Delimiter argument)
> I'm trying to write a macro where the first step is to turn control
> over to the user to specify a spreadsheet file that is to be opened.
[quoted text clipped - 7 lines]
> proceed with the opening of the specified file by recognizing tabs as
> the delimiter between the columns?