Why did you feel you had to change the permissions from the CLI? You could have changed them from within Konqueror or Dolphin instead, and then you wouldn't have had to worry about the spaces.
When you manipulate files with spaces in their names from the command line or in a script, you either have to use the backslash as an escape character before every space, or you have to enclose the filename within quotes. If you do the same thing from a GUI program, you usually don't have to think about the spaces at all.
I know that some very knowledgeable forum members disapprove of spaces in Linux filenames, but nevertheless the spaces aren't actually a problem if you just know how to handle them. I have several hundreds of movies with spaces in their names on my hard drives, and I've never found those spaces problematic in any way.
And by the way, Linux could handle spaces in file names long before Windows could.