What does HRESULT 0xC00D109E (NS_E_WMPCORE_FAILED_TO_BUILD_PLAYLIST) mean?

NS_E_WMPCORE_FAILED_TO_BUILD_PLAYLIST

NS_E_WMPCORE_FAILED_TO_BUILD_PLAYLIST: the failing boundary

NS_E_WMPCORE_FAILED_TO_BUILD_PLAYLIST (0xC00D109E) means Failed to build the playlist. The important boundary is playlist construction; do not replace this result with a broader “Windows Media failed” diagnosis.

What this result proves

This code proves that Windows Media Player could not construct the playlist graph/list from the supplied playlist data. It does not, by itself, prove a codec, permissions, network, device, or media problem outside that boundary. Preserve the first lower-level result when one exists, because later Player or Encoder errors can hide the original cause.

Evidence and focused verification

Preserve the playlist url/file, parser result, failing entry, and nested playlist chain; reduce to the first entry that prevents construction. Keep the media object, endpoint, profile, or device identity fixed while changing only that rejected precondition. A successful retest should pass this exact boundary; a different HRESULT from a later stage is new evidence, not recurrence of NS_E_WMPCORE_FAILED_TO_BUILD_PLAYLIST.

Technical references

• Windows Media Player playlists.
• IWMPPlaylist.