What does HRESULT 0xC00D109F (NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_NONE) mean?

NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_NONE

NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_NONE: the failing boundary

NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_NONE (0xC00D109F) means Playlist has no alternates to switch into. The important boundary is playlist alternate selection; do not replace this result with a broader “Windows Media failed” diagnosis.

What this result proves

This code proves that the current playlist item has no alternate entry to switch to. 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

Record the playlist item identity and alternate list; treat an empty alternate set as the condition to fix rather than as a media-open or network error. 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_PLAYLIST_ITEM_ALTERNATE_NONE.

Technical references

• Windows Media Player playlists.
• IWMPPlaylist.