Not sure what you mean by 'depth of the folder structure' but your multiple choice answers suggest that you actually mean the length of each directory name? Windows recommends that the maximum should be 215 characters (including spaces) but some programmes cannot recognise these so you should stick to shorter names.
Your OE problem should be simple (in theory!), go to 'Tools / Options / Spelling' and at the bottom of the spelling tab you should find an option to select the language of the dictionary you want to use.
Hope that helps :0)