ISAPI: Memory Mapped Files - FileNotFoundException

Hi

I am writing a program in .NET4 which generates Memory Mapped Files in this way: MemoryMappedFile.CreateNew("TEST", int.MaxValue))
 
I have created ISAPI module which is instaled on IIS7, this module would read MemoryMappedFile but unfortunately it does not work, I get an error: System.IO.FileNotFoundException: Unable to find the specified file.
 
The Program is on the same PC as IIS7, IIS works on the same user as my program. If I put my code from ISAP to another program, I can read MemoryMappedFile without any problems. It looks like IIS blocked MemoryMappedFile between system aplication and ISAPI.
 
How to solve it? MemoryMappedFile is important to me.

Thanks