Problem opening device from Java on Windows XP

Hi,
I am having trouble opening the TUN device (it is a virtual network device developed by the OpenVPN project - http://openvpn.net) from Java on Windows.
I found from the registry that the key for the device on my machine is
{5998ABF4-70CC-4B8C-9CBF-F2B985BAD4A2}.
From elsewhere on the web, I found that on Windows this device can be
addressed as \\.\{5998ABF4-70CC-4B8C-9CBF-F2B985BAD4A2}.tap
I then wrote up a short C code,
char *tun_dev_name = "\\\\.\\{5998ABF4-70CC-4B8C-9CBF-F2B985BAD4A2}.tap";
FILE *f = fopen(tun_dev_name, "rw");
fclose(f);
HANDLE h = CreateFile(tun_dev_name, GENERIC_WRITE | GENERIC_READ, 0, 0, \
OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
CloseHandle(h);In the above code, the FILE* returned is non-NULL and the HANDLE returned is positive.
However, when I try to do the same in Java using the code below,
String tun_dev_name =
new String("\\\\.\\{5998ABF4-70CC-4B8C-9CBF-F2B985BAD4A2}.tap");
RandomAccessFile raf = new RandomAccessFile(tun_dev_name, "rw");
[]/code]
a "java.io.IOException: Invalid argument" is thrown. The same exception is thrown when I try to open either FileInputStream or FileOutputStream instead of RandomAccessFile.
In fact, when I invoke the above C code as a native method from within Java,
though a valid HANDLE is still returned, the FILE* returned is now NULL. I
have tried giving all permissions to my codebase using Java's policytool, but that didn't help. BTW, I ran all this code on Windows XP from cygwin.
Clearly this problem isn't with OpenVPN because I'm able to open the device using both fopen and CreateFile from C. Please let me know if one of you knows what the problem could be and what I need to do to fix it. In case, this is not the right forum for this question, kindly let me know which other forum I should pose this question on.
Thanks!
Harsha

I am sorry but looks like somehow some text got missed out from my message.
After the C code and before the Java code, I had intended to mention that when that C code is compiled and run independently, both the fopen and CreateFile calls work fine, with a non-NULL FILE* and a valid HANDLE being returned, respectively.
And as I have already mentioned, when I invoke the C code as a native method from within Java, the CreateFile still works but the fopen fails returning NULL.
Sorry for missing that out. Hope somebody will be able to help me out.
Thanks!
Harsha

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