Don't worry about that
You need the suitable software to open the files
It is called "Acrobat Reader"i
Here are links to download the files
Choose just ONE of them
ACROBAT READER : LINK 1
ACROBAT READER : LINK 2
and here is another link in this forum
[https://www.filehippo.com/download_fo...759ca0e1/FOXIT READER[/URL]