Konqueror handles most common file types in the way you described.
~M

Quoting Don Livingston <deljr@compuserve.com>:

> Hi, Comrades,
> 
> I'm reviewing a bunch of old text files.  To make the process less
> tedious,
> I'd really like an app that shows a file list in a left-side window and
> has
> a right-side window that displays the contents of whichever file in the
> left
> is selected.  Certainly there must be something like that out there,
> but
> I'll be darned if I can find it.  Any leads?
> 
> Don.
> 
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