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I have two Microsoft Excel documents that are, except for the data contained within, virtually identical. One was created as an offshoot of the other. In the Finder, the original displays a thumbnail for the icon but the offshoot copy displays the standard Excel icon with the (XLSX) "button" in the lower left corner.

I've tried:

  1. "Save As" and giving the file a different name. That didn't work.
  2. Checking Get Info on both and the only anomaly I see is that the offshoot is a larger file, despite containing fewer tabs and less data.

How to make the Finder show the icon thumbnail for all Excel documents?

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When you "get info" is the "open with" application the same for both? – Kyle Cronin Aug 30 '11 at 6:56

The document filename doesn't matter as much as its extension. Usually .xls or .xlsx will preview OK where comma separated values, tab delimited documents, or something other "spreadsheet" format, which are really just text files rendered in Excel or Numbers, may not preview the way you expect in the Finder.

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open Finder, locate the file and drag it to the sidebar

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How is this going to provide customized Icon? – Buscar웃 Sep 14 '14 at 4:11

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