If I'm working on a style sheet, i.e., style.css, and I mistakenly click on preview, then WB creates a prev0~.htm file in the style.css folder. That's fine, I understand WB must need to create a html page someplace to show the styles.
What I don't like is this: I delete the prev0~.htm file but then it keeps getting recreated every time I save the style.css, even if I don't use preview again. The number of the file keeps counting up with each save.

The only way to stop this file is to close/reopen WB and not preview the style sheet again.
Like I said... It's probably not a bug... except if you count that fact that it bugs me
