A family of Microsoft word processing software products for creating web, email, and print documents.
Sorry I can't be of more help but Apple is passing the proverbial buck 🙂 Nothing in the Microsoft programs or any other programs has the ability to delete user content unless it is written to a location where it shouldn't be stored in the first place. That would be in one of the support folders owned by that particular program or the suite to which that program belongs.
Apple's own guidelines prohibit programs from deleting files as well as any other file management operations on the internal storage device. The macOS owns the Desktop. The OS is responsible for file management. The programs merely call for the services. Any calls for saving, closing, duplicating, deleting, etc. are handled by the OS. The programs & their installation processes have nothing to do with disk management. Neither does installing or updating software involve the Desktop or its content — especially if the program isn't running.
This has been an ongoing bone of contention with Apple for decades which has worsened over the last several editions of macOS. Apple refuses to acknowledge it but always has discouraged saving to the Desktop. The normal response is that user files should be saved to the Documents folder & hierarchies created within it.