Some of the manuals included with Mac OS 8.5 are in Adobe Acrobat format. These files have "pdf" at the end of their names. To view or print these documents you must install Adobe Acrobat Reader, located in the Adobe software folder on the Mac OS 8.5 CD.
If you have encountered other issues since installing Mac OS 8.5 please read the About Mac OS 8.5 Read Me and Installing Mac OS 8.5 Read Me that come with Mac OS 8.5.
This information is from the Knowledge Base article 58129: "
Mac OS 8.5: About Mac 0S 8.5 Read Me".