Many users have reported that the Word icons are not showing up for .docx and .doc files on their systems. Instead, they show up with a generic (unknown) or plain white icon even though the files open in Word when double-clicked (i.e., the file association settings are intact.)
Cause
Blank or missing Word icons on .doc and .docx files may occur due to multiple reasons, such as deleting the Office installer folder (which contains the Office icons) or installing multiple versions of Office on a computer. This may have been caused if you install and later uninstall a Microsoft Office alternative software (e.g., Open Office, WPS Office, etc.)
An incorrect Programmatic Identifier (e.g., docx_auto_file) or wrong file association settings in the Windows registry for Word documents can also cause this issue. Last but not least, a corrupt icon cache can also trigger the problem.
This article tells you how to fix the icons for Word document file types .docx and .doc using different ways.Read more