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Is there any way to force application to run in 32-bit mode on 64-bit Windows ?
My Os is windows 7 64 bit.

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What's the problem you're actually trying to solve? – Daniel Beck Jan 27 at 21:13
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In fact the vast majority of programs ARE 32 bit already. – horatio Jan 27 at 21:37
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If you are trying to run a 64-bit program, there is no way to run it as 32-bit. Executable format is different, system calls are designed for 64-bit. Simply it is incompatible with 32-bit environment. This is why you can not run a 64-bit executable on 32-bit operating systems and 32-bit processor.

If you are trying to run a 32-bit program, the program is already run as 32-bit. 64-bit processors are compatible with 32-bit programs. 64-bit Windows (or any other 64-bit operating system) replaces 32-bit system calls with 64-bit ones by emulation or any other technique.

So x-bit is about the processor, operating system and executable; it's not a mode. you can not force a 64-bit executable to run as 32-bit. 32-bit indications on Windows process list only show that a program is actually 32-bit and thus run in 32-bit system call emulation mode. You can not force this artificially.

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Some programs may use a loader which will start a 64 bit or 32 bit executable and such loaders might be tricked to start the 32 bit version on 64 bit Windows. Furthermore interpreted and JIT-compiled programs might be able to trick system into using 32 bit interpreter/compiler with cerian settings, even if 64bit is available. – AndrejaKo Jan 27 at 22:31
I did not think that the question meant "building an executable that runs in 32 bit", I thought what is required "running an existing application in 32 bit". If we are talking about an executable that forces itself to run in 32-bit, then these kind of tricks might make it work. – utkuerd Jan 27 at 22:41
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