The free Microsoft Office 2010 IconPack features icons for Excel, Word, Outlook, etc. totaling 60 in all. All are in ICO and PNG formats with a resolution of 256 x 256 pixels. To change an icon to one of those in this pack, open the 'Information' dialog on the icon you want to use. Copy the image to the clipboard and then select the icon you want to change and paste it in. Alternatively, you can use a program like
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