Cubase essential 5 and LE 5 back compatible?

I have both cubase le 5 and essential 5 running on different systems versions 5.1.0 and need to access project files made from cubase 4 version 4.5.1. Cubase 5 tells me it cannot open these files. Is there something I’m missing? Is back compatibility not supported with these versions? Losing money not being able to access these project files. please help!! much thanks.

So what? Cubase LE 5 ? Cubase Essential 5 ? Cubase 5 ? LE and Essential 5 will not open Cubase 4 files, while Cubase 5 will.

That is what I suspected. Thanks for the confirmation, I appreciate it.