I've gotten the game running just fine with industrialcraft and buildcraft as a minecraft.jar folder, but when i compress the folder again to play the game with the minecraft.jar file as usual the game won't even load, anyone else have this problem? 
[Support] Installation weirdness
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... What?
i mean... What?
Nor Ic2 or Buildcraft goes into the minecraft.jar
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sorry, i should clarify i think. I have the buildcraft zips and the industrialcraft jar file in the mods folder, and modloader, modloader mp in the jar file folder, along with too many items mod.
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Forge?
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Obtain an error report by running this tool:
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sorry, i'm all over the place today, i have forge running as well yes.
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bc2 isnt going to minecraft.jar ? i droped my bc and RP2 to jar with kevlator slopes and it works fine tho u can get crash if thers ID conflicts normaly rp and bc have those i got only ic2.jar in mods folder i patched it with mc patcher to get those in did u instaled modloader modloader mp forge ( with correct number for correct version ) ?