Pleasant message as alternative to RunTime Error

A few months ago an EE expert helped me with some code to establish a link to a file stored in a network folder. I don't have access to the folder, but some of the users have been receiving a runtime error 52: 'Bad file name or number'. No idea what that means. As an alternative to that message, I was thinking it might be better to give them a message box with a better explanation. Since someone helped me with the code, I don't know exactly what each line is doing. Would appreciate any help or suggestions.

Thanks, Dale

Public Function Relink()
Dim str As String, path As String, fname As String, tbl As String, strlnk As String, str1 As String, str2 As String
Dim l1 As Integer, l2 As Integer
Dim db As DAO.Database

fname = "stocklist.csv"
path = "\\000.00.00.00\Forecast"
tbl = "Stocklist"
str = path & "\" & fname
If Dir(str) & "" = "" Then
    path = "e:\tmp"
    str = path & "\" & fname
    If Dir(str) & "" = "" Then
        MsgBox "File not found", vbOKOnly
        Exit Function
    End If
End If
Set db = CurrentDb
strlnk = db.TableDefs("Stocklist").Connect
l1 = InStr(1, strlnk, "DATABASE") + 8
str1 = Left(strlnk, l1)
str2 = Mid(strlnk, l1 + 1)
l2 = InStr(1, str2, ";")
If l2 = 0 Then
    str2 = path
Else
    str2 = path & Mid(str2, l2)
End If
db.TableDefs(tbl).Connect = str1 & str2
db.TableDefs(tbl).RefreshLink
Set db = Nothing
End Function

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