How do I create or edit .BLK file to use with the dataextraction command

I want to add an attribute to a BLK file I have from a past release.  Using this .BLK file, I can create a table from attributes in my drawing using a LISP routine.

It seems there is no way to create or edit a .BLK file that I can use for this in ACAD 2011, it only creates .DXE files. 

The problem with the .DXE file is that is saves the drawing that the original extraction is performed on.  When I use the .DXE in another drawing, it uses the original drawing data unless I manually "delete" the old drawing reference using the dialog box in the extraction wizard.

The .BLK file works perfectly, but I want to add an attribute.  How can I create a new, or edit my old .BLK file?

Will I have to reinstall an older version of AutoCAd to accomplish this?

Thanks,

Eric