it says "file://www.botf2.com/bote/Shared%20Documents" was not found. Make sure the path or url exists". Sounds pretty much like a messed-up code part in the webfldr.aspx file. It always worked before the crash.
Seems like the explorer view works on all aspx pages:
http://www.ascentium.com/blog/sp/Post49.aspx . if i look at the code there, it's slightly different to the navtoframe method in our webfldr.aspx.
Okay, one step closer, one needs to have the "WebClient" service up and running unter control panel administration clients. Still it hangs up, but it gets now a little further than before. It says now: Please wait while Explorer View is loaded. If Explorer View does not appear, your browser may not support it.
I give up. I'm sure one of my recent Windows updates has killed the feature..