How to deal with a sealed class when I wanted to inherit and add properties

Question

In a recent question on Stack Overflow, I asked how I might parse through a file name to extra meta info about a file.

After I worked through that problem, I decided

Answer 1

Pass-thru?

class BackupFileInfo : IEquatable
{
    public long Length {get {return FileInfo.Length;}}
    //.... [snip]
}

Also, a prop called FileInfo is asking for trouble... it may need disambiguation against the FileInfo class in a few places.