Can't read a file with readonly attribute

[Kaplas80]

Describe the bug
Reading a DataStream from a readonly file throws a UnauthorizedAccessException.

Seems to happen only in Windows.

To Reproduce

            string tempFile = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
            File.WriteAllBytes(tempFile, new byte[] { 0xCA, 0xFE, 0x00, 0xFF });
            File.SetAttributes(tempFile, FileAttributes.ReadOnly);

            Node node = NodeFactory.FromFile(tempFile);
            byte[] buffer = new byte[4];
            _ = node.Stream.Read(buffer, 0, 4);
            node.Dispose();

            File.SetAttributes(tempFile, FileAttributes.Normal);
            File.Delete(tempFile);

Expected behavior
It should read the file contents.

Exceptions

  Message: 
    System.UnauthorizedAccessException : Access to the path 'C:\Users\<removed>\AppData\Local\Temp\ojuirizr.zau' is denied.
  Stack Trace: 
    FileStream.ValidateFileHandle(SafeFileHandle fileHandle)
    FileStream.CreateFileOpenHandle(FileMode mode, FileShare share, FileOptions options)
    FileStream.ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)
    FileStream.ctor(String path, FileMode mode, FileAccess access)
    LazyFileStream.Initialize() line 145
    LazyFileStream.Read(Byte[] buffer, Int32 index, Int32 count) line 86
    DataStream.Read(Byte[] buffer, Int32 offset, Int32 count) line 475
    NodeFactoryTests.ReadFromReadonlyFile() line 616