Windows Defender Definition Updates File Location

Looking for the file path location for Windows Defender updates? Windows Defender updates it’s definitions from Microsoft Update and stores the definition files here:

C:\Documents and Settings\All Users\Application Data\Microsoft\Windows Defender\Definition Updates\

or here for Windows 7:

C:\ProgramData\Microsoft\Windows Defender\Definition Updates\

Be aware that the Windows Defender Definition Updates folder is a hidden folder, so you may have to enable viewing of hidden folders.

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