Redmine

I use the WebDav-Plugin to manage my documentes.
With Redmine i can create a new document with caracters(< > ? " : | \ / *) that cant handle by windows.

All i need is to add a "validates_format_of" in app/models/document.rb with regex /\A([^<>\?":\|\\\/\*]+)\Z/i.
The Regex filters the caracters(< > ? " : | \ / *). If one of these found, we get an error.

After line 30:

...
validates_presence_of :project, :title, :category
validates_length_of :title, :maximum => 60
# valid title (filename) for Windows
validates_format_of :title, :with => /\A([^<>\?":\|\\\/\*]+)\Z/i, :on => :save

named_scope :visible, lambda {|*args| { :include => :project,
                                          :conditions => Project.allowed_to_condition(args.shift || User.current, :view_documents, *args) } }
...

Source: http://en.wikipedia.org/wiki/8.3_filename#Directory_table

This excludes the following ASCII characters:
" * / : < > ? \ |
Windows/MSDOS has no shell escape character

I hope u add this to core :)