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I guess you have specified the path to Internet Explorer like this
"C:\Program Files\Internet Explorer\iexplore.exe"
But because the \ character is an “escape” character in a literal string, you need to defeat the escape
"C:\\Program Files\\Internet Explorer\\iexplore.exe"
There was no error when you compiled because the compiler cannot check whether the command passed to system() will be meaningful, or valid at runtime.
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solved opening Internet Explorer using c programming language