If I want only html files, I can use the options:
-*.gif -*.jpg -*.exe -*.zip -*.avi -*.css -*.js -*.mpg
-*.mov -*.qt -*.arc -*.swf (aso)

It would be easier, faster, better to simply use:
-*.* +*.html

If I would only - say - gif files (without html), it would be:
-*.* +*.gif

But, it doesn't work. Maybe I made a mistake. Maybe it is a
bug. What's the matter?