The FMEVENT_SELCHANGE message is sent to an extension DLL when the user selects a filename in the File Manager directory window or Search Results window.
FMEVENT_SELCHANGE
This message has no parameters.
An extension DLL should return zero if it processes this message.
Changes in the tree portion of the directory window do not produce this message.
Because the user can change the selection many times, the extension DLL must return promptly after processing this message to avoid slowing the selection process for the user.