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  4. DPX
FolderRisk: Caution

DPX C:\Windows\Logs\DPX

Logs of the DPX component (delta package expansion) used during updates and upgrades; useful for decompression errors.

Updated on By AltF4 Formation

What it’s for

DPX is the component that expands delta packages (difference files) while cumulative updates and upgrades install. Logs\DPX receives its logs, mainly setupact.log and setuperr.log.

What it contains

  • Traces of package expansion, with decompression or out-of-disk-space errors.
  • Information that complements CBS.log when an update fails during the expansion phase.

Risks and best practices

  • You can delete these files without any effect on Windows, but keep them during an update diagnosis: they often tell you whether the failure comes from the disk.
  • They cite component store paths: review them before sending them to a third party.

Useful commands

Fenêtre de terminal
# Last lines of the most recent log
Get-ChildItem "$env:windir\Logs\DPX" -File -ErrorAction SilentlyContinue |
    Sort-Object LastWriteTime -Descending | Select-Object -First 1 |
    ForEach-Object { Get-Content $_.FullName -Tail 40 }

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