Saving a File as .RTF
There are many word processing applications available. Each word processor saves files in a slightly different version from each other. For example, Microsoft Word saves files in .DOC or .DOCX format, Microsoft Works uses .WPS, and OpenOffice Writer uses .SXW. As you might expect, word processing applications may have trouble opening files with different formats.
To solve the problem, save your file as Rich Text Format (.rtf). RTF is a universal format that is available in most, if not all, word processing applications. RTF may not include all the features of word processing applications, like images, page numbering, tables, etc., so your instructor may require using a specific word processing application for certain assignments or classes.
In your word processing application, select "Save As" from the File menu.
You will see a box. Look for Rich Text Format (.rtf) in the Save as type drop-down list.
Click Save. You can now attach the file to a Blackboard assignment, and your instructor should be able to open it.