MIME types converted to .txt

I found this (about Horde): http://wiki.horde.org/MimeMagic?Horde=89068dd5308a7d09bbbe9682288ad75&re...

Which essentially says to install a couple of things and configure a MIME magic file in /etc/php.ini. After doing all this, I couldn't get it working, and then stumbled over this: http://uk2.php.net/manual/en/function.mime-content-type.php#50756

...which says to put the following in your php.ini:
[mime_magic]
mime_magic.debug = On
mime_magic.magicfile = "/usr/share/file/mime.magic"

Note: I found the magic file in /etc/httpd/conf and in /usr/share/magic.mime didn't work properly (causing lots of startup errors in error_log). I also find that switching debug off stops the mime magic working.

Incidentally, those of a PHP hacking nature, the code that does the checks is in includes/file.inc and basically says:

if (function_exists('mime_content_type')) {
$file->filemime = mime_content_type($file->filepath);
if ($file->filemime != $_FILES["edit"]["type"][$source]) {
watchdog('file', t('For %file the system thinks its MIME type is %detected while the user has given %given for MIME type', array('%file' => theme('placeholder', $file->filepath), '%detected' => theme('placeholder', $file->filemime), '%given' => theme('placeholder', $_FILES['edit']['type'][$source]))));
}
}
else {
$file->filemime = $_FILES["edit"]["type"][$source];
}

...in other words, if your PHP has mime_content_type, then make sure it does what it's supposed to! (Which may help you diagnose/fix the problem without any Drupal or other issues involved).