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How do Mozilla products run on Windows 64 bit when they are 32bit products

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  • 最后回复者为 bonnyjars

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I have some 32bit legacy software I would like to run on 64-bit Win10 pro. There does not appear to be a way to run such software and yet I see that my Mozilla software (Firefox, Thunderbird) (and also my AV software) is 32 bit and it runs happily on this machine How do you do that? Thanks,

I have some 32bit legacy software I would like to run on 64-bit Win10 pro. There does not appear to be a way to run such software and yet I see that my Mozilla software (Firefox, Thunderbird) (and also my AV software) is 32 bit and it runs happily on this machine How do you do that? Thanks,

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Thanks for the answers - basically re the software I want to run, I know it is 32-bit with some odd calls from 16-bit days. On 32-bit Win 10 it actually runs relatively successfully on NTVDM.exe not all calls work, but I can work around them. This software has never run on 64-bit and Windows 10 pro (that I have) 64-bit does not have the capability to run back to older versions of Windows that are not themselves 64 bit

The product itself is not upgradeable beyond what I have

So: thanks for all the answers but I will have to live with 2 machines or drop the legacy software

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32-bit programs can run on 64-bit machines as most devices are compatible with lesser things.

But a 64-bit program may not run on a 32-bit machine.

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Firefox is available in both 32-bit and 64-bit versions and both run on 64-bit Windows 7, 8, 8.1 and 10.

If your older 32-bit software won't run on 64-bit Windows, it may be because Microsoft no longer supplies some system files. You can try using compatibility settings to see whether that helps, or check with the vendor.

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Firefox has been available as 64-bit (Win64) for 64-bit Windows ever since Firefox 42.0 Release and is listed at www.mozilla.org/firefox/all/

The Thunderbird community that makes Thunderbird (not Mozilla) has only made 32-bit version for Windows as there is no Win64 version and is actually not really needed. While 64-bit Thunderbird is actually needed for Mac and 64-bit Linux.


If you see WOW32 in a useragent then it means it is a 32-bit application running on 64-bit Windows. https://en.wikipedia.org/wiki/WoW64

Some older legacy software and games may only work or be made to work on Windows 7 and perhaps 8 (8.1) but have issues or not work on Windows 10.

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选择的解决方案

Thanks for the answers - basically re the software I want to run, I know it is 32-bit with some odd calls from 16-bit days. On 32-bit Win 10 it actually runs relatively successfully on NTVDM.exe not all calls work, but I can work around them. This software has never run on 64-bit and Windows 10 pro (that I have) 64-bit does not have the capability to run back to older versions of Windows that are not themselves 64 bit

The product itself is not upgradeable beyond what I have

So: thanks for all the answers but I will have to live with 2 machines or drop the legacy software