Each program has a different file extension, which is a series of letters Office adds to the end of a file name that identifies in which program that file was created.

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This statement is true. Different programs have different file extensions added to the end of a file name to identify in which program the file was created. For example, Microsoft Word files have the file extension ".docx" while PowerPoint files have the file extension ".pptx".

Each Program Has a Different File Extension, Which Is a Series