Opening smplayer from thunar path issue

After doing an emerge -avuDN world the other day, I've come across a very annoying issue: when I try to open a file with smplayer from thunar that contains a space in the filename, the file isn't played. Files without spaces in the path open fine. For example,

/home/gr0x0rd/files/downloads/casino.mp4

works fine but

/home/gr0x0rd/files/downloads/casino [1995].mp4

doens't work. VLC and mplayer work fine.

I've tried changing Exec=smplayer %U to Exec=smplayer %F in /usr/share/applications/smplayer.desktop (found on ubuntu forums by googling) but that doesn't fix the issue.

In the above example, when I open the file with the space in the path, smplayer's title bar shows

file:///home/gr0x0rd/files/downloads/casino%20[1995]/mp4

Any ideas where the setting is to change this?

Thanks!