Sent to a WIMMessageCallback function to indicate progress during an image-cleanup operation.
WIM_MSG_MOUNT_CLEANUP_PROGRESS wParam = (UINT) dwPercent; lParam = (UINT) dwTicksRemaining;
[in] Specifies the percentage of the cleanup that has been completed.
[in] Specifies the estimated number of milliseconds until the cleanup operation is complete.
Your routine must return WIM_MSG_SUCCESS.