Start by checking which build you did: Debug can generate files than Release for example.
Then look at the files you create: DLL, PDB, and XML triplets (or DLL and PDB pairs) are almost certainly packages you reference (whether you meant to or not).
.CONFIG holds your application settings, EXE and PDB are your app.
PDB files hold the debug info, XML holds Intellisense data for items where you documented them with a "triple comment" indicator:
Function MyFucntionName() As ReturnType