SOLVED - .htaccess question

Can't believe that I can't get this to work.

I have the following url
/int/FULL-DEC18-100-F899139DF5E1059396431415E770C6DD.pdf

And I need to rewrite it to this

/int/index.php?$1

I have this

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} int
RewriteRule ^int/(.*) /int/index.php [NC,L]

Code (markup):

But I get a 500 error.

Any idea what I am doing wrong?

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