|Microsoft DirectX 9.0|
Sent by the Windows Media Format SDK when an application uses the ASF Writer to index Windows Media Video files.
Can be one of the following WMT_STATUS messages.
|WMT_STARTED||Indexing has begun. lParam2 is zero.|
|WMT_CLOSED||Indexing has completed. lParam2 is zero.|
|WMT_INDEX_PROGRESS||Indexing is in progress.|
If lParam1 is WMT_CLOSED or WMT_STARTED, then lParam2 is zero. If lParam1 is WMT_INDEX_PROGRESS, then lParam2 is a DWORD that expresses the amount of progress as a percentage.