Open folder doesn't autoload external subtitles

As reported in: http://forum.videolan.org/viewtopic.php?f=14&t=62334

VLC Open Folder option doesn't autoload external subtitles for files that are opened. With normal Open File the external subtitles are autoloaded correctly. Tested under Win32.

Sample folder showing the issue (extract the zip to somewhere and use Open Folder to subtest folder): http://koti.mbnet.fi/raiska/vlc_samples/subtest.zip

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