Excerpt from README.rtfd included in WMInspector.WrapperInspector.compressed:
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Jim Million    uunet!wiltel!jmillion    October 1992    				              

WrapperInspector (v1.0)

WrapperInspector is a custom WorkspaceManager Contents Inspector.  It 
registers with WM to manage inspection of 'wrapped' (also refered to as
'bundled') WM files.  Bundles appear as files in WM when in fact, they are 
actually directories.  For example, .app, .bundle, .rtfd are bundled files.
Normally, you have to 'Open As Folder' to see into these wrappers.  

WrapperInspector displays a bundle's contents in a browser.  You may select 
entries in this browser to 'sub' inspect (for example, you may view .tiff 
images, or play .snd files).  You may also 'Open' the file with its default 
application, and/or 'Open As Folder' if it is a directory.  You may extend 
WrapperInspector by registering other wrapper types with WM, creating new 
subinspectors to handle other file types, and registering additional file 
types with existing subinspectors.
