know if .lib is static or import

Use the lib command. If it's static, lib will show you a pile of .obj files inside. Not so if it's am implib.

lib /list foo.lib

will do it.

powershell script

Get-ChildItem "D:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\Debug_test\" -Filter *.lib | 
Foreach-Object {
     & "D:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\lib.exe" $_.FullName >> 1.txt
}

see also

1. know if .lib is static or import
2. Managing a Library