I’m trying to make an application-level add-in for Excel and I would like to store certain information about the program’s state. The information I want to store pertains to the state of each Excel file (rather than across all Excel files).
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I use CustomDocumentProperties in the workbook itself (not the add-in)
http://www.dailydoseofexcel.com/archives/2004/07/16/custom-document-properties/
Then when I open a workbook, I check for the existence of the CDP to determine if it belongs to my app, if it’s a particular type of file used by my app (for context sensitive menu items), and to read state information for that workbook.
That link doesn’t show a good example of writing to CDP, but I think it looks like