What does HRESULT 0xC00D1261 (NS_E_BKGDOWNLOAD_INVALIDJOBSIGNATURE) mean?

NS_E_BKGDOWNLOAD_INVALIDJOBSIGNATURE

NS_E_BKGDOWNLOAD_INVALIDJOBSIGNATURE: isolate the owning operation

NS_E_BKGDOWNLOAD_INVALIDJOBSIGNATURE (0xC00D1261) is not a catch-all media error. It reports that a background download job does not carry the signature/ownership expected for a Windows Media Player job.

Do not discard these details

• Capture the BITS job ID, creator/owner identity, job description or custom properties, Player process/session, and the code path that handed the job to WMP.
• Preserve the first HRESULT or lower-level result produced before cleanup or automatic retry changes the state.

How to prove the correction

Create or obtain the job through the Player-supported path and verify WMP accepts the same operation without reusing a foreign BITS job.

Technical references

• Background Intelligent Transfer Service.
• IBackgroundCopyJob.