[Solved] Changing the extension of multiple files to jpeg using C#

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JPEG files are not text files. You need to Read and write bytes instead. ie:

DirectoryInfo d = new DirectoryInfo(@"E:\New folder (2)");
FileInfo[] Files = d.GetFiles(); 

foreach (FileInfo file in Files)
{
   string changed =  Path.ChangeExtension(file.FullName, "jpg");
   File.Copy(file.FullName, changed);
}

Of course file themselves should be JPEG for this to work.

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solved Changing the extension of multiple files to jpeg using C#