mod_rewrite and mod_speling not working together

I have a site where mod_rewrite is needed for a custom php framework.   The site in question is being transfered from a windows server using ASP to a linux server and will be converted to php.  On the windows server the files could called with case insensitivity.  I'm trying to duplicate this because a lot of links on the site don't match to the exact case of some of the folders or filenames.  (we didn't build the site, we're just tranfering it, and I don't know why the original developer did that.)

I enabled mod_speling but if mod_rewrite is on with our rules, it doesn't work.  If I take out our mod_rewrite rules, then mod_speling works as it's supposed to.  I understand why this happens.  Our rewrite rules have conditions that state that if the REQUEST_FILENAME is not a file or directory then execute the rule.  

I don't know if it's possible, but can mod_speling and mod_rewrite play nice and work together?

Here's the information in our .htaccess file for mod_speling and mod_rewrite.

<IfModule mod_speling.c>
    CheckSpelling On
</IfModule>

<IfModule mod_rewrite.c>
    RewriteEngine On
         
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f    
    RewriteRule ^(control)$ admin.php?use=yes [L,NC]
   
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f    
    RewriteRule ^(control/)(.*)$ admin.php?use=yes&url=$2 [L]
   
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.*)$ frontend.php?use=yes&url=$1 [L]    
</IfModule>

Thank you.
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purfusAsked:
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ahoffmannConnect With a Mentor Commented:
I guess mod_spelling is a bad idea for something like you have: "a lot of links on the site don't match to the exact case of some of the folders or filenames"
This sounds like you may have files like:
  Foo.baR
  fOO.Bar
  foo.bar
and so on ...
in that case mod_spelling gets confused too.

I'd clean up your filenames, for example use only lower case.
First search for "duplicates" as I described above, and make a decision how to rename them.
Then convert all filenames to lower case:
   find . -type f -name \*.xxx -exec perl -e '$f=$ARGV[0];rename$f,lc($f);' {} \;

then you cann use a simple rewrite rule:

RewriteMap lc int:tolower
RewriteRule ^/(.*) ${lc:$1}
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