Hello
I am a Chinese user

For example
I download a movie from this URL
http://xfwb.store.qq.com:443/?bcac20a8c55a946191adf755ce64d7d4d2f170be7172607bebd687e5aef22b006a638eb933dca373ed5f84b6b5f84a0f22186239b753efe21ed6a72aa9864cfa/JTVCJUU2JTgzJThBJUU1JThGJTk4JTVELkFsbC5vZi5hLlN1ZGRlbi4xOTk2LkhLLlNVQkJFRC5EVkRSaXAuWDI2NC4yQXVkaW8uQUMzLmlOVC1Ob3dZUy5ta3Y=

The correct file name should be [惊变].All.of.a.Sudden.1996.HK.SUBBED.DVDRip.X264.2Audio.AC3.iNT-NowYS.mkv

However, in FDM, after added this job, it became %5B%E6%83%8A%E5%8F%98%5D.All.of.a.Sudden.1996.HK.SUBBED.DVDRip.X264.2Audio.AC3.iNT-NowYS.mkv

Which means become

But when I tries IDM, it recognises the Chinese characters correctly.

By the way
When I using FDM to download this movie through Firefox (Firefox 11.0 + FlashGot), FDM can't download the file and says "Unkown sever error"
but when I using IE, it is all right. Why so?

这个问题我很早就发现了，貌似对中文字符的支持不是很好。