issue with "eqchangesv21.zip" unzipping

[tehslaughter]

i use 7zip, not what you call awesome at this type of stuff, but when i try to 7zip>extract files it gives me this:

Can not open file C:\Users\insertnamehere\desktop\eqchangesv21.zip' as archive

any thoughts?

edit* the uichangesv2 extracted just fine however...