One way is to use a macro:

Option Explicit
Sub auto_open()
Dim WkbkName As String
Dim TestStr As String

WkbkName = "book2.xls"

TestStr = ""
On Error Resume Next
TestStr = Dir(ThisWorkbook.Path & "\" & WkbkName)
On Error GoTo 0

If TestStr = "" Then
MsgBox "design error! " & WkbkName & " wasn't found."
Else
Workbooks.Open Filename:=ThisWorkbook.Path & "\" & WkbkName
End If

End Sub

If you're new to macros, you may want to read David McRitchie's intro at:
http://www.mvps.org/dmcritchie/excel/getstarted.htm

aposatsk wrote:

Upon opening my main excel file, I would like another file in the same
folder to be opened. Is this possible?

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Dave Peterson