![]() \Microsoft Security Client\ can be added to an offline boot.wim so it's available when booted - just remember to add it to \Program Files\Microsoft Security Client\.The only difference is the names of the files extracted in step 3 above - \FilesList64.dll and \mpam-fe圆4.exe are required in 64-bit builds. The above steps can be adapted/applied to 64-bit versions of WinPE.Why rebuild boot.wim just to update the virus definitions? Exception might be when PXE booting. This in my opinion just makes it more difficult to update the definitions file - it's located fine at the root of the USB drive or CD/DVD. Some blogs suggest adding \FilesList32.dll and \mpam-fe.exe to boot.wim.Why? Well done Microsoft for imposing such a seemingly stupid limitation. A 64-bit version of Windows Defender Offline is required for scanning a 64-bit version of Windows. A 32-bit version of Windows Defender Offline is required for scanning a 32-bit version of Windows.Tested the above in 32-bit versions of WinPE 3.1 and WinPE 5.0 - it appeared to work fine in both.No packages were required - it worked in a minimal WinPE build.OfflineScannerShell.exe wouldn't work from any path other than X:\Program Files\Microsoft Security Client\OfflineScannerShell.exe - when attempting to run it from another location it failed to start.Ran X:\Program Files\Microsoft Security Client\OfflineScannerShell.exe.Copied the D:\Microsoft Security Client\ directory (extracted in step 4 above) to X:\Program Files\.wim file was mounted as drive X: and the USB drive (containing \FilesList32.dll and \mpam-fe.exe extracted/copied in step 3 above) was mounted as drive D. Booted my MistyPE USB drive - the relevant.Opened F:\sources\boot.wim in 7-zip and extracted the \Program Files\Microsoft Security Client\ directory to the root of drive E:\ (my USB drive).Copied F:\FilesList32.dll and F:\mpam-fe.exe (the virus definition file) to the root of my existing MistyPE bootable USB drive (drive E:\). ![]() ![]() Mounted D:\WDO_Media32.iso as drive F:\ (using imdisk).Downloaded Windows Defender Offline - there are various posts containing direct download links - I simply ran mssstool32.exe and selected the " As an ISO file on a disk (Advanced)." option to create an ISO file - in my case D:\WDO_Media32.iso.So here's what I did - it's a bit rough, and it's not automated, but it seems to be working fine and will point you in the right direction if you are interested. Now how about adding Windows Defender Offline to a customised WinPE? Let's say a very small MistyPE build. In my case that's X:\Program Files\Microsoft Security Client\OfflineScannerShell.exe once WinPE has booted. Looking at the \Windows\System32\winpeshl.ini file in boot.wim identifies the relevant program -ĪppPath = "%ProgramFiles%\Microsoft Security Client\OfflineScannerShell.exe" So Windows Defender Offline is essentially a WinPE 3.0 modified to run the Windows Defender GUI.
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