Chad, In this case "[MarshalAs(UnmanagedType.LPWStr)] ref/out string" will work, because the runtime frees the string memory with CoTaskMemFree() by default, and FindMimeFromData() allocates it with CoTaskMemAlloc().
If you for some reason want to use an IntPtr parameter instead, free the memory with Marshal.FreeCoTaskMem(). Mattias === Mattias Sjögren [EMAIL PROTECTED] You can read messages from the Advanced DOTNET archive, unsubscribe from Advanced DOTNET, or subscribe to other DevelopMentor lists at http://discuss.develop.com.
