Preferred apllications and hidden files

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http://forums.fedoraforum.org – I've got two noob questions, but I can't find it easily, so I ask here... Forgive me. :) First is this: Whenever I open a file through - say - Open Office, the list of files I get shown automatically also show all the hidden files. Right click -> uncheck hidden files does the trick only for one session. If I hit Open again, they're shown again. How can I set it to not show hidden files by default in the 'open file' dialogue (for all apps)? Second is this: Under preferences, there's an item called 'preferred applications'. This is great, and works ok, but is way too general for me. How can I set that files with certain extensions always open with one app, and files with another extension always open with another app. For example, how can I set that AVI's always open in VLC, but MPEGs in Movie Player. And MP3s with Songbird... (HowTos)