Yes indeed this can’t work with .wid files.
Under previous release you can transform .wid file to .rep by opening them under dski ! I don’t know if this works under Xi.
Note that there are some softs that can create documentation upon all your reports.
There is no readily available software for doing this. However using Rebean Java Webi SDK, I was able to do it. But my scenario was very huge so I had to use it to extract the required fields and create tables in a database and feed them. I am generating reports out of it by creating a universe out of it. I am able to get everything including the report properties like : objects used in the report, creation time, last modification time, owner, last saved by, refresh on open, universe and all the other stuff. If you are familiar with java, it really is not a big deal. I was not so familiar so it took me 2 months to figureout how to do it. The documentation and the sample jsp programs are available for download in the business objects website. They provide a really good start.