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can u give me the difference between Shell and ShellExecute... Is it correct...that In shell command have to specify .exe file first and next the file which is to be opened or executed And in ShellExecute command,it ditermines first the file extension and then opens that file calling that...

ShellExecute to open pdf file,but i want to know whether acrobat reader is installed I used ShellExecute to open .pdf file. But now i want to know whether AcrobatReader is installed in any system before opening any .pdf file. Please Help me out