This can be a simple htaccess question for experts but I've been looking to get this sorted for some time. It was something a developer did before time with this particular code. He cut down the look file extension in the demands. For example,

/images/btn/Find a bear should obtain the URL transformed internally to /images/btn/Find a bear.gif

All of the images within the folder are .gif extensions.

I attempted this URL rewrite at the bottom folder but it didn't help.

Options +FollowSymlinks
RewriteEngine On
RewriteRule ^images/(.*)$ images/$1.gif

I understand that RewriteRule is enabled around the server, etc. Help.

You’re most likely getting an infinite loop. Do this:

RewriteCond $1 !.*\.gif$
RewriteRule ^images/(.*)$ images/$1.gif