Problem with NTFS Hard Links (for Lucene index replication)

Hi, am using NTFS hard links to do Lucene index replication.* I'm not sure why, but seems like if I make a hard link to a file with CreateHardLink API (from kernel32), then if I subsequently open the original file for reading, I cannot delete the hard link with DeleteFile or with File.Delete from .NET.* It fails with "file is locked by another process" error.* But according to MSDN, DeleteFile should work since it is just decrementing count of hard links not actually deleting the file.

Here is code to reproduce...

Assume test.txt exists already...

// create new hard link "testHL.txt" pointing to original file...
CreateHardLink("testHL.txt","test.txt",IntPtr.Zero);

// open text.txt for reading, but now I cannot delete hard link...
using(StreamReader r=new StreamReader("test.txt"))
{
* *** string c=r.ReadLine();
*** * File.Delete("testHL.txt");