visual studio 2005 - system command not running exe file using variable as param -

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I am writing code to download an app in Visual Studio 2005 (VC ++). After downloading it, when I start running it 3 line exe file does not run, while I write it as 

  system ("c: /pg/ap/app.exe")   
 Does it start to run, can someone tell me why this is happening?    1.const char * str; 2. HRESULT hr = URLDownloadToFile (NULL, _T ("file_path / app.exe"), (LPCWT) str, 0, NULL); 3. System (str);    
 
 
 Instead using the  system ()  function, Try  shellExecute () , this will solve your problem.  
 For more help

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