After downloading the Student Solutions Manual for a particular chapter, you may be left with files with a .pdf.bin extension, such as 1_1.pdf.bin. If this is the case, simply remove the .bin extension by renaming the files. For example, you would rename 1_1.pdf.bin as 1_1.pdf. After renaming the files, you should be able to double-click on them to launch Acrobat Reader.