No it doesn't because it is just like force upating but you do need to update your worlds.
No, the updates only change the features in the game. Your worlds should be fine.
Nope.
You dont.
The only way to delete mods easily (when not using a mod installer) is to force Minecraft to update before you log in to Minecraft go to Options and Click Force Update, then log in Minecraft will re-update itself to the current version
No, only if you delete your .minecraft folder, minecraft isn't 'installed' so you can't uninstall it either, just deleting it from your desktop does the trick, all your worlds will be left alone.
No it will not
delete your BIN and then run minecraft, it will then be cleared and restored, this doesn't change your worlds.
Can ordering a pizza delete your house?even when you install the mod your save data is still going to be there unless you delete it yourself or reinstall minecraft.
if you are using windows 7 1 click start, type %appdata% 2 open . minecraft and delete bin 3 start minecraft and update if you are not using windows 7 1 click run/%appdata% 2 open . minecraft and delete bin 3 start minecraft and update
delete a mod maybe and force the update?
No, deleted worlds are unrecoverable.
Just right click on the file and click "Delete File(s)" UPDATE: IF IT WONT DELETE YOUR SCREWED!
The easiest way to delete a Minecraft mod is to force update. When you start Minecraft, where you hit log in below that there is an options button. Click on that and hit Force Update, and it should change to will force! You will have to re-install any mods you would like again as that deletes all mods. If you don't want to do that you can go through your minecraft.jar and delete the mod file by file. Experience: Experienced Minecraft Modder
Did you buy minecraft? If you did, then keep logging in. After logging in AT LEAST ONCE, the not downloaded text will never appear, and you can press "play offline!". But if you accidentally delete minecraft off of your computer, you have to log in again.