Help with .htaccess image redirects

[darkNiGHTS0]

I am running an SMF forum and because of custom board icons, there are five separate PNG files that are all the same for different boards. I tried creating a .htaccess file in notepad with these contents:

Redirect /Themes/Captain%20Placeholder/icons/91/on.png /Themes/Captain%20Placeholder/icons/69/on.png
Redirect /Themes/Captain%20Placeholder/icons/84/on.png /Themes/Captain%20Placeholder/icons/69/on.png
Redirect /Themes/Captain%20Placeholder/icons/59/on.png /Themes/Captain%20Placeholder/icons/69/on.png
Redirect /Themes/Captain%20Placeholder/icons/28/on.png /Themes/Captain%20Placeholder/icons/69/on.png

and placed it in the root directory of the forum. But it doesn't work. Could someone help me out?

[Fou-Lu]

How did you test that it doesn't work? Did you remove the original images from the filesystem or check the httpd logs to see?
Does your server allow you to issue redirect using an htaccess?

[darkNiGHTs]

I used Google Web Developer tools to check the location of the image and it's still the same. And I'm pretty sure it allows use of .htaccess, but it's possible it doesn't. Does the code look right?

[Fou-Lu]

The redirect looks fine to me.
You need to check your apache logs to see if it actually redirects it. HTML wise, it will remain as the original. I have no idea what the google tools do.
Don't forget to clear your cache as well.