Either *docs or docx depending on which version (year) of office you use.
They are spreadsheet files and Excel refers to them as workbooks.
yes
You cannot edit any of them. You can view Word, Excel, Powerpoint, Pages, Keynote, and PDF documents, but you cannot edit them.
Powerpoint is not designed to directly open Excel documents. Powerpoint can import spreadsheets and charts and you can copy data from Excel into Powerpoint. Powerpoint also has a built in feature for creating very simple spreadsheets and charts.
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types of functional documents?
Excel Saga was created in 1999.
Excel Records was created in 1966.
Lotus Excel was created in 1982.
Excel Entertainment was created in 1999.
Excel Communications was created in 1988.
Surf Excel was created in 1953.