仅限chrome中的文件编码问题

I have different links which opens another page in a popup.The popup function is like this.

function popUp(URL) { 
eval("lesson = window.open(URL, 'lesson', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width=800,height=600,left = 250,top = 50');");
}

When links are opened,its working fine in mozilla.When links are opened in chrome its giving me the following content

The filename has spaces.I dont if this is happening because of this space or not because I am not able to rename or upload the files into that server