Your sheets should not have been affected, except in the recent files location. You did not mention what operating system you are using, but on Vista and 7 you open your documents folder and type the name or partial name, of the spred sheet into the search window in the upper right corner of the window, and all sheets matching will show up.
A workbook
is a spreadsheet file. By default, each workbook in Excel contains three pages
or worksheet
The term spreadsheet is often used to refer to a workbook, when in
actual fact, spreadsheet refers to the computer program, such as Excel.
So,
strictly speaking, when you open the Excel spreadsheet program it loads an empty workbook file consisting of three blank worksheets for you to use.
Excel is
a spreadsheet developed by Microsoft but is by no means the first spreadsheet.
The very first spreadsheet was developed
(or invented) by Dan Bricklin and Bob Frankston called VisiCalc. VisiCalc was a
spreadsheet written to operate on the Apple II computer and was released
in 1979. The program was sold to Lotus who developed Lotus 123 from the
VisiCalc principle. Lotus 123 was released in 1983.
Excel, first released in 1987, is a
development of the early spreadsheets and therefore cannot strictly be
classified as an invention. Excel is far more powerful than VisiCalc but that
is also a result of development over the years that Microsoft have been working
on the product, and the increase in computing power.
Dan Bricklin and Bob Frankston never patented the product because software patents were almost unheard of in the 70s.
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