An extension can send the following window messages to retrieve relevant
information from File Manager. File Manager is guaranteed to respond correctly only
to messages sent from the FMExtensionProc
||File Manager returns drive information from the active window. An extension
provides a pointer to an FMS_GETDRIVEINFO structure; File Manager fills the structure with drive information.
||File Manager returns information about a selected file from the active File
Manager window (either the directory window or the Search Results window). An
extension provides a pointer to an FMS_GETFILESEL structure; File Manager fills the structure with file information.
||Same as the FM_GETFILESEL message except that the selected file may have a
||File Manager returns a value that identifies the type of window with input
||File Manager returns the count of selected files in the directory and Search
||Same as the FM_GETSELCOUNT message except that the count includes files with
||File Manager repaints either its active window or all of its windows. This
message is similar to File Manager's Refresh command on the Window menu.
||File Manager reloads all extensions. First, File Manager unloads all
extensions, sending an FMEVENT_UNLOAD message to each extension. Then, it reloads the
extensions, sending an FMEVENT_LOAD message to each extension. The
FM_RELOAD_EXTENSIONS message allows an extension to uninstall itself by removing its setting
from the WINFILE.INI file; this action causes File Manager to reload the
remaining extensions. Other applications and programs (for example, installation
programs) can also post this message by calling the PostMessage function.
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