32-bit programs can access up to 4 GB of memory (RAM), while 64-bit programs can access much more. Besides being able to use more RAM, 64-bit applications can access some Windows APIs specific to 64-bit applications. Because of that we offer some of our programs as 64-bits in order to utilize the benefits of x64 computing.
Please note that 64-bit programs need x64 CPU and 64-bit version of Microsoft Windows to run, while 32-bit programs can run on both 32-bit (i386 or IA-32) and 64-bit (x86_64) operating systems.
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64-bit applications can't run on 32-bit Windows editions. However 32-bit applications can run on both 32-bit and 64-bit Windows editions.
Most applications don't need large amounts of RAM and don't need to be deployed as 64-bit executables. Vovsoft's rule of thumb is to keep everything simple and reach more people.
Even though 64-bit programs have many advantages, they do not have to run faster than 32-bit programs. In many cases, 32-bit programs run faster. So, we only publish 64-bit executables if we think the applications are worth doing.