The Windows "Open With" dialog box will help you quickly reassign a default program for your Excel documents.

The Online Tech Tips blog explains how to use a registry hack to add an "Open in New Excel Instance" item to your context menu—which will open your spreadsheet in a separate copy of Excel, so ...

How to Open Excel 2007 Files As Separate Windows. If you work with multiple Excel files over the course of a workday, and especially if you use a dual-monitor setup, you might wonder how you can ...

If Microsoft Excel opens a Blank screen when you open an existing file, then you can stop Excel from opening a Blank workbook or sheet.

An open-source Java project has opened up to Excel. Now developers using the Mondrian OLAP can apply the Microsoft app and receive support options under the project’s new spreadsheet services.

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.