serialize/unserialize and 32/64 bit integers

Hello, I am having a problem with unserializing integers with Windows XP/PHP 5.2.11. The serialization takes place on a Linux x86_64 host. The values then gets passed to the Windows machine that is 32 bit. I think the problem is 32/64 bit related. If I serialize a number say 2600001234 on 32 bit Windows it becomes s:10:"2600001234". If I do the same from 64 bit Linux it becomes i:2600001234. Is there a way to force it to serialize as a string on 64 bit PHP? If it matters this is an index of an array. Thanks, James