nix-wine-experiments/pkgs/mfc42/default.nix

# mfc42.dll / mfc42u.dll, taken from the Visual C++ 6.0 redistributable.
{
  runCommand,
  fetchurl,
  p7zip,
  cabextract,
}:

let
  # To get the hash: nix-prefetch-url --type sha256 <url>
  redist = fetchurl {
    url = "https://download.microsoft.com/download/vc60pro/Update/2/W9XNT4/EN-US/VC6RedistSetup_deu.exe";
    hash = "sha256-wuuR2cREjVDkajL+y8w7QYcG0AK+q5tfSYHeVSCYzuc=";
  };
in

runCommand "mfc42"
  {
    nativeBuildInputs = [
      p7zip
      cabextract
    ];
  }
  ''
    # VC6RedistSetup_deu.exe is a self-extracting archive that 7z can unpack;
    # the vcredist.exe inside it is a CAB holding the actual DLLs.
    7z e ${redist} vcredist.exe -otmp -y

    mkdir -p $out/windll
    cabextract tmp/vcredist.exe -d $out/windll -F "mfc42*.dll"
  ''