[Can I install my own mods to the techniclauncher?]

This may sound stupid, but should I extract the files (the .class ones) from SomeMod.rar into modpack.rar, or should I just move SomeMod.rar right into modpack.rar? I've been trying to get the XP tomes for Mystcraft and they don't work.

[Looks like Techniclauncher is downloading Minecraft 1.3.2 for Tekkit 3.1.2]

Tekkit loads up as vanilla for me, but Technic still works. I think it's because of this.

Also following.

[No mods updating correctly (Even Vanilla) from the Launcher]

My Tekkit launcher recently went all white screen on me even before the Mojang title screen went up. I was playing in offline mode, so I thought maybe connecting to the internet would fix it. I connected, ran Tekkit and recieved a notice about a new update to Spoutcraft. I thought maybe this was why my Tekkit wasn't working (stupid me) so I updated. After the update, all my Tekkit-items and blocks (basically all the mod-items) were gone. I had vanilla minecraft, but forge and optifine were still there.

My question is: if I ever fix this, will I be able to reload that world and get all my tekkit-items back? Or have I ruined that save?