You'll need to have excel running for this to work.
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Some versions of windows have scheduler programs. (Or you can get a
freeware/shareware version on the web (www.shareware.com is where I look first.)
Then you could have that scheduling program start an excel workbook. If you
name the macro Auto_Open, then it'll run when the workbook opens.
(But your pc will have to be on <vbg> for that to work!)