Allow all file types for upload

I’m using WordPress 3.4.2 for a private blog, i.e. one on which only I can post. Now, WordPress prevents me from uploading certain file types (like C# source files). As far as I understand it, there’s a white-list that defines what can be uploaded.

Is there a plugin that can extend – or better, even disable – this white-list?

All other answers tell me I should edit my theme but I’d rather have a plugin for that (so that I don’t need to edit all my themes).

Also, I found this plugin but, again, it requires me to edit some file on my server (that’s probably overwritten when the plugin is updated).

So, is there anything else?

Answers:

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Method 1

You can create a plugin or add this to the config file, but for 3.9.2 this worked for me.

define('ALLOW_UNFILTERED_UPLOADS', true);

Method 2

Filter 'user_has_cap' and set 'unfiltered_upload' to 1.

Sample code not tested:

/*
Plugin Name: Remove Uploads Filter
Plugin URI: http://wordpress.stackexchange.com/questions/67225/allow-all-file-types-for-upload
Description: Disables white-list filter for uploads
Version: 1.0
Author: WPSE - @toscho
*/

add_filter( 'user_has_cap', 'wpse_67225_unfiltered_upload' );

function wpse_67225_unfiltered_upload( $caps )
{
    $caps['unfiltered_upload'] = 1;
    return $caps;
}

Method 3

Unfortunately, toscho’s answer doesn’t work – at least not in WordPress 3.4 and above.

The correct solution is the following:

#
# For this, see: wp-includes/capabilities.php > map_meta_cap()
#
function wpse_6533_map_unrestricted_upload_filter($caps, $cap) {
  if ($cap == 'unfiltered_upload') {
    $caps = array();
    $caps[] = $cap;
  }

  return $caps;
}

add_filter('map_meta_cap', 'wpse_6533_map_unrestricted_upload_filter', 0, 2);

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0