|Do you have that problem with all .pdf files? If so you need to associate pdf files with whatever software you use to read them, such as adobe reader. To do that, right click on a pdf file, choose 'open with', select the program to use and then check 'always use this selected program to open this kind of file' and then click OK.|
If this is the only pdf file you're having the problem with make sure that particular file has a .pdf extension.
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