I suppose this links may give you some good idea on the topic, Check it out....... :)
http://www.filerepair.ca/DLL-EXE-downloads/f/fl/Flash-Video-Extension.dll-Download-File-Flash-Video-Extension.dll.html
http://www.corruptedfilerepair.com/File-Information/Flash-Video-Extension.dll-Flash-Video-Extension-Adobe-Systems-Incorporated.asp
http://dllcentral.com/flash_video_extension.dll/2.0.0.494/
http://www.corrupteddatarecovery.com/File-Data/Flash-Video-Extension.dll-Flash-Video-Extension-Adobe-Systems-Incorporated-2.0.0.494.asp
http://www.dll-download-system.com/home/f-dlls-not-system-/flash-video-extension.dll/details.html
http://www.fyxm.net/flash-video-extension.dll-download-17583.html