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Are Windows window classes case sensitive?

MS docs are clear as mud (and strings with class names are not referenced very often), I was wondering if the class name for Win32 is the window class really case sensitive?

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They are not case sensitive. Window class names are ATOMS string and according to MSDN ,

  • Case does not matter when searching for the name of an atom in the atom table. In addition, the entire string must match the search operation; no substring is executed.
  • , , 255 . .
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