They are spreadsheet files and Excel refers to them as workbooks.
yes
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.
You cannot edit any of them. You can view Word, Excel, Powerpoint, Pages, Keynote, and PDF documents, but you cannot edit them.
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types of functional documents?
Lotus Excel was created in 1982.
Kamloops Excel was created in 2007.
Excel Records was created in 1966.
Excel Maritime was created in 1988.
Surf Excel was created in 1953.
Excel Communications was created in 1988.