A File Manager extension (or another application) sends an FM_RELOAD_EXTENSIONS message to cause File Manager to reload
all extension dynamic-link libraries (DLLs) listed in the [AddOns] section
of the WINFILE.INI file.
wParam
Not used.
lParam
Not used.
This message does not return a meaningful value.
Other applications can use the PostMessage function to send this message to File Manager. To obtain the appropriate File Manager window handle, an application can specify WFS_Frame as the lpszClassName parameter in a call to the FindWindow function.