From within VB2010 program, how do you "open" an associated document file using Windows file associativity? For example, as part of my programs data set, I have an excel workbook form that the program uses. I already know how to start Excel from withing the program. What I want to be able to do is let windows start the appropriate application program and load the file, simialr to what happens when you double click a file from Windows Explorer or on the desktop. In general, this data set could have Word docs, Excel workbooks, pdf files, etc...