Fixes content_type lenght. Mime types can have length up to 127 chars. http://tools.ietf.org/html/rfc4288#section-4.2

Fixes content_type lenght. Mime types can have length up to 127 chars. http://tools.ietf.org/html/rfc4288#section-4.2

Ex: application/vnd.openxmlformats-officedocument.wordprocessingml.document