[rhn-users] apache : mod_rewrite question

[FM]

Hello for specifics folders
I want that :
if http://www.site.org/a1/b1/f2/test.htm;
does not exist, if return this page :
http://www.site.org/a1/b1/f2/index.html

there is a lot of 'f' folder.

What I try :
RewriteEngine On
RewriteCond ^/(a1)/(b2)/([^/+])/%{REQUEST_FILENAME} !-f
RewriteRule /$1/$2/$3/index.html [R]

But I have the 404 error page


Some ideas ?

Thanks !!!