How to compile a code which was originally compiled by Archimedes C-51 compiler V4.23?

My code was compiled using the Archimedes C-51 compiler V4.23. I want to use Keil uVersion2 to compile it. But Keil only support those codes using at least Archimedes C-51 compiler Version 5.

Does anybody have any idea for compiling my codes?

Thanks

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