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Home/ Questions/Q 8395151
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Editorial Team
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Editorial Team
Asked: June 9, 20262026-06-09T20:13:38+00:00 2026-06-09T20:13:38+00:00

I’m using VS2008 and the project properties are set for (active) x64 and the

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I’m using VS2008 and the project properties are set for (active) x64

and the weird thing is _WIN64 is not defined and WPARAM and LPARAM are still 32-bit.

Should I define _WIN64 manually?

If so, where should I put #define _WIN64? Preprocessor setting doesn’t seem to work.

I’m quite certain it’s compiled as x64 because in task manager the exe has no *32 postfix.

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  1. Editorial Team
    Editorial Team
    2026-06-09T20:13:39+00:00Added an answer on June 9, 2026 at 8:13 pm

    The thing is,

    _WIN64 is already defined by compiler but the IDE couldn’t recognize it. (seemed fixed in VS2010.)

    The values of sizeof(WPARAM) and sizeof(LPARAM) are both 8 (not 4)

    The IDE shows codes in *ifdef _WIN64* block in grey color as if they were inactive, which are not.

    http://bugs.python.org/issue1558

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