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crwdns2934241:0crwdne2934241:0 Dan

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Click on a spreadsheet document, goto the menu '''''File''''' then slide down to '''''Get Info''''' your files info pane should be open twist the twisty '''Open with:'''  There you can alter the application to use in this case MS Excel to alter all spreadsheets click on the '''''Change All''''' button

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open