Originally posted by Burtsplurt
The new version of WinRar (3.xx) uses filename.partx.rar. Maybe you have an old version?

That's probably of no help whatsoever.
You can configure it to compress using the old system

I think the format of your thing is "ace". Regardless of the format, just use winrar to force the opening : select all of them <b>in winrar</b> and click "extract" (or "view" to see what's inside) (winrar's cool, it lets you open almost any kind of archive from any part of it) and choose to extract all to the place you want it to go.