Solve “You are not allowed to upload ‘FileName’. the requested file type: 'FileType’” problem on Vanilla Forum 1.x

Issue:

You get this exception when you try to upload any file in your Vanilla Forum (Version 1) using any Attachment extension :
You are not allowed to upload ‘FileName’. the requested file type: 'FileType’

Resolution 1:

Add specified type as allowed type. Steps to do so follow here:

1. Note the 'FileType’ in the error message.
2. Go to extensions\Attachments\default.php file in your Vanilla forum’s directory.
3. Add appropriate entry in Context->Configuration['ATTACHMENTS_ALLOWED_FILETYPES'] list.
4. Note that it’s also important that you give correct extensions for the mime type you are allowing as both, 'FilteType’ (i.e. mime type) and file extensions are corss checked in Framework code of vanilla forum.
5. Save the file and test.

Resolution 2:

Remove check for allowed types. Note that this is not very safe for public forum but it’s ‘ok’ for internal forum with known and responsible user. Steps to do so follow here:

1. Go to “library\Framework\Framework.Class.Uploader.php”  file.
2. Find this line of code “if (!array_key_exists($FileType, $this->AllowedFileTypes))”  and comment this ‘if’ and ‘else’ of it. Yes you need to comment if AND else.
3. Save the file and test.