$ ghc-pkg list
C:/apps/HaskellPlatform/7.10.2-a\lib\package.conf.d:
    Cabal-1.22.4.0
    GLURaw-1.5.0.1
    GLUT-2.7.0.1
    HTTP-4000.2.20
    HUnit-1.2.5.2
    ObjectName-1.1.0.0
    OpenGL-2.12.0.1
    OpenGLRaw-2.5.1.0
    QuickCheck-2.8.1
    StateVar-1.1.0.0
    Win32-2.3.1.0
    array-0.5.1.0
    async-2.0.2
    attoparsec-0.13.0.1
    base-4.8.1.0
    bin-package-db-0.0.0.0
    binary-0.7.5.0
    rts-1.0
    bytestring-0.10.6.0
    case-insensitive-1.2.0.4
    cgi-3001.2.2.2
    containers-0.5.6.2
    deepseq-1.4.1.1
    directory-1.2.2.0
    exceptions-0.8.0.2
    fgl-5.5.2.1
    filepath-1.4.0.0
    (ghc-7.10.2)
    ghc-prim-0.4.0.0
    hashable-1.2.3.3
    haskeline-0.7.2.1
    haskell-src-1.0.2.0
    hoopl-3.10.0.2
    hpc-0.6.0.2
    hscolour-1.23
    html-1.0.1.2
    integer-gmp-1.0.0.0
    mtl-2.2.1
    multipart-0.1.2
    network-2.6.2.1
    network-uri-2.6.0.3
    old-locale-1.0.0.7
    old-time-1.1.0.3
    parallel-3.2.0.6
    parsec-3.1.9
    pretty-1.1.2.0
    primitive-0.6
    process-1.2.3.0
    random-1.1
    regex-base-0.93.2
    regex-compat-0.95.1
    regex-posix-0.95.2
    scientific-0.3.3.8
    split-0.2.2
    stm-2.4.4
    syb-0.5.1
    template-haskell-2.10.0.0
    text-1.2.1.3
    tf-random-0.5
    time-1.5.0.1
    transformers-0.4.2.0
    transformers-compat-0.4.0.4
    unordered-containers-0.2.5.1
    vector-0.11.0.0
    xhtml-3000.2.1
    zlib-0.5.4.2

C:\Users\mcarter\AppData\Roaming\ghc\i386-mingw32-7.10.2\package.conf.d:
    multiset-0.3.0