Path to temporary file is invalid when clicking on attachment

Our company developed (visual studio 2010) a windows form program that reads .vol (assci text files).  The program accepts command line arguments and when we click on a .vol on our hard drives, the file opens with our application no problem.  When we receive a .vol file in outlook and click on it and tell outlook to open it, outlook passes this argument to our program "C:\Documents and Settings\rbev\Local Settings\Temporary Internet Files\Content.Outlook\3IG91WL3\00792003_2013030100_112219_032013232343.vol"

I look in that directory and the file is not there so the program cannot open it.

What can we do to make outlook put the temp file there or give a correct path?

Thanks,

Bob

Bob Bevers