The above notwiths tanding, the following shall apply in connection with appeals filed by a party entitled to appeal but which was not a party to the proceedings that led to the decision being  appealed:   (a) Within fifteen (15) days from the notice of the decision, such party/ie s shall have the right to request a copy of the full case file pertaining to the decision from the Anti- Doping Organization that had Results Management  authority;   (b) If such  a request  is made  within  the fifteen  (15) day period,  then  the party  making  such  request  shall  have  twenty -one (21) days  from  receipt  of the file to file an appeal  to CAS.