After you save a document to a file on disk, the program you are using automatically assigns a file extension to the filename you provide.

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Quizplus · Accepted Answer

This is true. Most programs will automatically assign a file extension based on the type of file that was saved (e.g. .docx for Word documents, .jpg for image files, etc.). However, some programs may require you to manually specify the file extension during the saving process.

After You Save a Document to a File on Disk