1. created a package structure with an empty "lib\net35" folder
2. called "nuget.exe pack"
WARNING: 1 issue(s) found with package 'Test2267'.
Issue: Incompatible files in lib folder.
Description: The file 'lib\net35\_._' is not a valid assembly. If it is an XML documentation file or
a .pdb file, there is no matching assembly specified in the same folder.
Solution: Either remove this file from 'lib' folder or add a matching .dll for it.
Issue: This is a valid scenario, we shouldn't warn, at least not with this error ( _._ is created by nuget.exe pack).
We could warn that there won't be any lib installed for that fx though.
Comments: Fixed in Nuget 2.2