It is unclear what you are asking. Each application that creates files uses its own specific file formats, appropriate for the purposes of that application.
The Microsoft program that is used to create project schedules is called Microsoft Project. It comes as one of the packages of Microsoft Office.
I believe the only Microsoft program used to create spreadsheets is Microsoft Excel.
When you create a spreadsheet or workbook then a corresponding file is created on your machine, that file is known as excel file.
A word processing application is a program that helps the user create and modify text files. The most popular word processing application currently is MS Word.
Microsoft Word
Microsoft excel
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Microsoft Windows Powerpoint 2007 is a program that is used in many different fields for presentations. Microsoft Windows Powerpoint 2007 is a program to create presentations in slides.
There are many ways to create an application depending on how it will be used. Try Microsoft Developer Network for more information on developing applications for Windows. http://msdn.microsoft.com
Microsoft Word is not a system software, not by any means. It is a WordProcessing application bundled in Microsoft Office Suite. This application is used to create documents such as letters, reports, books and so on. Because this application helps users for word processing tasks, it is classified under Packaged Application Software.
A Word Processor is a type of program that allows one to enter, edit, format, and publish text in a variety of ways. A few examples of word processors are: - Microsoft Word - OpenOffice Writer - Google Docs - Adobe Buzzword - Lotus Symphony For basic word processing, you can also use Notepad and Wordpad which both come with Windows.