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Currently, QuickBooks Desktop only accepts .DES file type for templates. We can look for Word(.DOCX) to .DES file type converter online.
After converting the file, we can already import it to the program. Here's how to do it:
You can also use these articles for reference when customizing the templates:
File types and extensions used by QuickBooks Desktop
Let us know if you need additional help in doing this. Have a great day!