Excel File Extension
Excel is a table and calculation software. You can open excel files with Open Office and Excel Viewer softwares.
Excel: It is a part of Office package. You can create different tables, graphics with Excel. Also, you have chance to make automatic formula calculations.
You will need an Office CD to install Excel software. However, you may use Open Office software as an alternative. Open Office is a free software.
Also, you have chance to use Excel Viewer software to check these files. But you can`t make adjustments with Excel Viewer.
These are the file types which created by Excel:
What needed to Open Excel file extensions.
Open Office, Excel Viewer
Links about Excel file extension