Word for Mac sometimes saves files without the extension (e.g. .doc, .docx or .rtf). If you're having trouble submitting a Word for Mac document, try these steps:
- Open your document in Word.
- Click File -> Save As.
- Choose a file format (.doc, .docx or .rtf).
- Enter the name, and make sure that it ends with the correct extension (without the quotes, for example: myfile.doc).
- Click Save.
Then try submitting this newly saved document.