The documents that you are trying to read are "PDF" files - "Portable Document Format" - so that they are easy to view, print, and share.
They are available in this way to avoid wasting paper; you can print the information that you want, when you want it.
PDF is a special type of format that has been widely available since at 2001 (but was created several years before).
It was invented so that documents could be shared, no matter what computer you are using.
Before PDF, if you created a document on a computer that uses Microsoft, Apple or any other brand of software,
only people with the same software would be able to read it.
The difference with PDF files is that although you do need special software on your computer to be able to read those files,
that software is simple, very safe (it's trusted world-wide) and it's FREE
Adobe Reader software is the global standard for electronic document sharing.
It is the only PDF file viewer that can open all PDF documents.
You can download the software by clicking the link below, then you will be able to open the documents:
Click here for more information and the option to download Acrobat Reader