I have a macro in Outlook VBA to grab data from an open Excel workbook (\"Workbook1\").
I reference the workbook as follows:
Dim objApp As Excel.App
I suspect that changing the file name to add in the full file path would work, so try changing the line:
Set wb = objApp.Workbooks("Workbook1.xlsx")
To something like:
Set wb = objApp.Workbooks("C:\Users\Documents\Workbook1.xlsx")