Is it possible to replace a specific php file?

I got a parse error for one of the template-function files, and can’t access wp at all now. It says the error is on line 226 and that a “‘” or a “;” is missing from it, but it doesn’t seem to be the case when looked at.
Is it possible to replace just that one file for a specific wp version? I’ve not been able to find a download for WP 2.05, and don’t want to upgrade at the moment.