Allow access permission to write in Program Files of Windows 7

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Your program should not write temporary files (or anything else for that matter) to the program directory. Any program should use %TEMP% for temporary files and %APPDATA% for user specific application data. This has been true since Windows 2000/XP so you should change your aplication.

The problem is not Windows 7.

You can ask for appdata folder path:

string dir = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);

or for TEMP path

string dir = Path.GetTempPath()

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