32bit program on 64bit

Hi friend, I have one program wich run on 32bit only.
There's a way, like VM option, to run the program on 64bit as if the machine would be 32bit??....thank you

A Java program? A pure Java problem should not care at all, if it's run on a 32 or a 64bit Machine/OS/JVM (except maybe for the amount of memory that's available).
If the program loads native libraries, then this might indeed be necessary.
Try the -d32 switch, which should tell Java to use a 32 bit JVM. Alternatively you need to download the 32bit JRE.

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