Strange! MS Office docs, when opened on my CI site, cause the session to be lost

[eluser]skattabrain[/eluser]
do you think an htaccess rewrite rule could cause this? like CI first looks for a controller by the name of the file, then does some redirect to tfile after it sees it's not a controller?

Here's my htaccess ...

Code:

<IfModule mod_rewrite.c>
RewriteEngine On

RewriteBase /

RewriteCond %{HTTP_HOST} ^domain.com [NC]
RewriteRule ^(.*)$ http://www.mydomain.com/$1 [L,R=301]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

</IfModule>