Comparing Assembly APIs

I saw this on the MS Download Center feed, but then Brad Abrams also mentioned it.  The LibCheck utility is used to compare the API of two assemblies.  It’s great for determining breaking changes between two assembly versions.  I know a certain testing guru who would love this thing (some of you know who I’m talking about). 

I was having some issues testing how it works to compare just two assemblies I had made (not WinFX assemblies) to see if it has some merit outside it’s original intended use.  When calling the utility with the -store option it would generate the file folder to house the store information, but would NOT generate the store info.  They provide the code as well, so I guess I’ll have to crack that open and take a look as to why.