If data is entered in a cell, I would like to automatically open a worksheet

In Sheet1, you can create an event based on cell changes.  This one, below, looks at any changes in Column C, then opens the file - you'll need to put the fill path in the code.

Open your Debugger and insert this code into the SHEET CODEPAGE you desire (e.g., Sheet1, etc.)
 

Private Sub Worksheet_Change(ByVal Target As Range)

    If Not Intersect(Target, Range("C1").EntireColumn) Is Nothing Then
        Workbooks.Open ("MG Mentions")
    End If
End Sub

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Dave

If the user types a path in the cell then it is possible. Else you will have to hard code the path in the code.

Sid

What Version of Microsoft office are you using?
If you right Click on the the cell and click HyperLink and chose a excel document that has been previously saved on computer.

Here, its enhanced - I created a sheet to store the filename which gets opened when change happens in column C.

Note this will open the file even if a cell is being cleared...

See code and attached

Private Sub Worksheet_Change(ByVal Target As Range)
Dim r As Range

    If Not Intersect(Target, Range("C1").EntireColumn) Is Nothing Then
            Workbooks.Open ([fname])
    End If
End Sub

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Dave
Open-File-Col-C-change-r2.xls

That's exactly what I wanted! Everyone else was under the impression I wanted to open another workbook, but this is the solution I was looking for. Many thanks!

Well, when you say "open another" - we kindof tend to get that impression.  As oppose to "add a new".

funny!

Cheers,

dave

Actually, I said "open another worksheet in the workbook" which should have clarified what I intended. Additionally, my example specified opening a worksheet, not a workbook. I'm not sure how much clearer I could have made it :)

You gave no example in your original question.  I was just suggesting a reason why "everyone else" potentially got that impression.  

I don't usually read "open a worksheet" to mean add a new worksheet to an existing workbook.  In prior versions of excel, there was only the worksheet and no tabs either.  So, "open a worksheet" was literally opening a worksheet file.

But you did just fine and one of us deciphered what you needed.

I'm glad you got your solution.

Dave

TheBaroness,
I thought your question was pretty clear. You mentioned worksheet three times between the question title and body, and even named it  :)

That said, the verb "open" is generally applied to workbooks that had previously been closed and now need to be opened. That's why Sid, Dave and bootheelbank made the suggestions they did. The correct verb for what you wanted to do is "activate," but this distinction is primarily enforced by VBA code syntax. I wouldn't expect most people to know that fine point.

Thanks for the kind words and grade!

Brad