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Can't seem to get wp_mime_type_icon filter to work so I can use custom image for icons in the Media Library for documents. @birgire answered this post with the following code, but it does not seem to work in current WordPress version.

add_filter( 'wp_mime_type_icon', function( $icon, $mime, $post_id )
{
    if( 'application/pdf' === $mime && $post_id > 0 )
        $icon = 'http://example.tld/pdf.png'; // Modify this to your needs!

    return $icon;
}, 10, 3 ); 

This throws an error failed to open stream: No such file or directory and points to the core functions file in wp-includes and a second exif error that it's trying to find the file in /wp-includes/images/media/ and ignoring the custom path.

I tried hard-coding the $icon path or using get_template_directory_uri() . '/my/path/pdf.png' but this also failed with the same errors. For some reason it's ignoring the path.

I just want to replace all of the images in /wp-includes/images/media/ with my own that reside in my theme. I only really need text/plain and application/pdf, but would be nice to know how to target them all, or just redirect to a different folder with same-named files.

Edit: I just noticed that this seems to work in grid view. In List view, the errors are thrown and the custom image is not used. I need it to work in both. Maybe it's a bug.

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