Vim move word skips dot

It's the 'iskeyword' option. You may be able to change this behavior simply by doing:

:set iskeyword-=.

If that doesn't work it means the period character is included in the option as part of a character range instead of individually, and you'll have to check the value (with the question mark as part of the command):

:verbose set iskeyword?

Then determine how to properly modify it to exclude the period. Take a look at this (with the single-quotes as part of the command):

:help 'iskeyword'

I should warn you that having the period character included in 'iskeyword' is not a Vim default, so you may have a filetype plugin or language specific syntax highlighting that is adding it. The reason it would is because the 'iskeyword' is used for many things, including certain regular expression atoms, which can be used in syntax highlighting. So removing it may "break" something else.