How can I remove optifine from tekkit?

[gavjenks]

The horrible graphical glitches it causes on frame motors + general uselessness to me as a mod make me want to trash it ASAP. However, since it modifies base classes... ? Is there a version of tekkit available without it or something?

[disconsented]

Proof that it is optifine specifically causing problems.

[Luvera]

Optifine causes problems on some computers.

• Make a backup of modpack.jar (located in %appdata%\.techniclauncher\tekkit\bin in Windows XP, not sure about other OS).
  

• Open modpack.jar with Winrar or 7zip.
  

• Delete the following files:
  

aaw.class

acq.class

adz.class

amd.class

Config$1.class

Config.class

ConnectedProperties.class

ConnectedTextures.class

ct.class

ctm.png

CustomAnimation.class

CustomAnimationFrame.class

CustomColorizer.class

GuiAnimationSettingsOF.class

GuiDetailSettingsOF.class

GuiOtherSettingsOF.class

GuiPerformanceSettingsOF.class

GuiQualitySettingsOF.class

hu.class

ItemRendererHD.class

jy.class

l.class

lr.class

lv.class

mx.class

NaturalProperties.class

NaturalTextures.class

nl.class

nq.class

RandomMobs.class

Reflector.class

template.natural.properties

TextureHDCompassFX.class

TextureHDCustomFX.class

TextureHDFlamesFX.class

TextureHDFX.class

TextureHDLavaFlowFX.class

TextureHDLavaFX.class

TextureHDPortalFX.class

TextureHDWatchFX.class

TextureHDWaterFlowFX.class

TextureHDWaterFX.class

VersionCheckThread.class

vl.class

wc.class

WrUpdateState.class

zq.class

• Download the latest Minecraft Forge for 1.2.5
  
• Copy the following files to modpack.jar:
  

aaw.class

acq.class

adz.class

ct.class

l.class

lr.class

vl.class

This fully removes Optifine. If you still have problems after doing this, Optifine was not the cause of your problems.

[MineCraftJunky28]

Well guys, i was tired of the bad textures in Linux, removing optifine worked for me. i do still have a few blocky textures, but i can live with them..

[Sunderland]

Using OpenSUSE, the solution detailed above also worked for me.

[stu2000]

Thanks Luvera! It seems to be working for me so far. I created a script to automate that fix (for linux users). Just download this into your home directory and run it. I made sure to give you credit in the header comments.

http://pastebin.com/raw.php?i=JRbuQky1