I have both Processing 1.2.1. &  1.5.1 installed on my machine - Windows 7, 64 bit. They have worked fine for many years. However, each time I install Processing 2.0 (or any of the earlier beta versions thereof) I can't seem to set the file associativity in such a way that the machine automatically recognises version 2.0. Version 1.5.1 is always started by default. Even when I try the ‘Open with’ option I can't manage to force the system to get version 2.0 recognised. It doesn't get recognised. I then went into ‘regedit’ and amended the file associativity there but still no joy. All of the versions were installed by extracting the folder from the website, unzipping and placing inside ‘Program Files’. Has anybody had a similar experience and managed to overcome this? I haven’t yet been able to find any related threads on the forum regarding this issue.