File opening question (Winxp)

Goodmornig,

A question about opening MAX-files. After updating MAX 5.0 to MAX 5.1.1 i can’t seem to open MAX-files from windows explorer. Before this i could just open the files by double-clicking them. Now after double-clicking my computer begins to rattle and "pretend" it’s opening but nothing happens. Has anybody else encountered this? And if so, how did you tackle it.

Question two- When installing updates, is it necessary to unistall the previous version or does it automatically overwrite?

Thank you,

FRid