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Thread: Is my App compatible with 64 BIT editions of XP and Vista?

  1. May 23rd, 2009, 10:44 PM #1
    Icyculyr
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    Is my App compatible with 64 BIT editions of XP and Vista?

    Hi, I'm testing my 32-BIT application on windows XP Pro, and Windows Vista Home Premium, will there be any problem for my App to run on 64-BIT?

    Also wondering, if my App has no bugs/problems with Home Premium (Vista) will anything on Ultimate (Vista) effect it? like Windows BitLocker Drive Protection? or anything like that?

    Kind Regards
    Me
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  2. May 23rd, 2009, 11:05 PM #2
    bmahler
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    Re: Is my App compatible with 64 BIT editions of XP and Vista?

    If you set your app to compile as x86 it will work on both 32 and 64 bit versions of windows. I have found that if you compile in a 32 bit os as Any Cpu, it will not work on 64 bit versions of windows.
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  3. May 23rd, 2009, 11:09 PM #3
    Icyculyr
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    Re: Is my App compatible with 64 BIT editions of XP and Vista?

    I see, thanks, can anyone else confirm this?

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    Me
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  4. May 24th, 2009, 01:50 AM #4
    AereoN
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    Re: Is my App compatible with 64 BIT editions of XP and Vista?

    Quote Originally Posted by Icyculyr View Post
    I see, thanks, can anyone else confirm this?

    Kind Regards
    Me
    Yeaps.
    I initially build on AnyCpu (default), then one day, a user complain that it's not working on 64 bit but after compiling on x84, it works for both without any problem.
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  6. May 24th, 2009, 02:18 AM #5
    Icyculyr
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    Re: Is my App compatible with 64 BIT editions of XP and Vista?

    Awesome, thanks a lot guys, why is that, does anyone know?

    Seems a bit strange to me, 64-BIT works on 32 and 64, but 32 not on 64

    Any idea's?

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    Me
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  7. May 24th, 2009, 08:13 AM #6
    Half
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    Re: Is my App compatible with 64 BIT editions of XP and Vista?

    Since when is 64 working on 32? It is the other way around, the 64-bit CPUs have a hardware enabled 32-bit emulation so they can execute such code without problems.
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  8. May 24th, 2009, 01:32 PM #7
    MaximilianMayrhofer
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    Re: Is my App compatible with 64 BIT editions of XP and Vista?

    Yea, I can't imagine any situation where a x64 compiled program could run on a 32bit machine.
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