Setting multiple file attributes

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Hello,

I am trying to uncheck the archive box and check the compress box for a
given file.

I am having trouble. It seems I can uncheck the archive box but nothing I've
tried will check the compress box.

Would someone point me in the right direction? I have no idea what I am
doing wrong.

Thanks in advance,
Aaron

class Class1
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{
Class1 c1 = new Class1();

c1.ComFile();
}

public void ComFile()
{
File.Create(@"D:\mydoc.txt");

//File.SetAttributes(@"D:\mydoc.txt", FileAttributes.Archive -
32);
//can't set only the compress file. This actually unchecks the
//Archive bit
File.SetAttributes(@"D:\mydoc.txt", FileAttributes.Compressed);

}
}