The best replacement for win32 is mfc.

The best alternatives to win32 are rated as following:
★★★★★  mfc
★★★★★  .net
★★★★  win64
★★★  _win32
★★  clr
★★  posix
★  wpf
★  winrt
★  windows forms
★  amd64
  clr visual c++
  posix threads
  win 64
  win32
  wxwidgets
  win16
  winfx
  gtk

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Google Trends

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win32
mfc
.net