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If I want to use two mods together, e.g. SinglePlayerCommands and TooManyItems (which don't state compatibility with one another), how can I tell if they will work together (and not break Minecraft - forcing me to re-download a fresh copy)?

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(These two mods do work together (For an awesome building environment!)) –  fredley Aug 16 '11 at 17:31
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One thing that can help you determine if two mods will work together is to check if any of the .class files in the mods have the same name. If so, the mods aren't compatible without merging the files. –  Fambida Aug 16 '11 at 19:13
    
Why do you ask yourself a question and comment it after to tell that's working ?? –  Warface Aug 16 '11 at 22:48
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@Warface I am asking the question in the general case, the specific case I gave was an example. –  fredley Aug 16 '11 at 23:06
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@Tom, I don't think that this is a duplicate, because the questions are trying to get different things answered. –  Joe the Person Aug 19 '11 at 0:46
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up vote 5 down vote accepted

There is no hard-and-fast rule other than simply installing them both and seeing if it blows up. However, there are some tricks for guessing ahead of time.

Firstly, mods which use the same API/framework/loader (e.g. ModLoader or Minecraft Forge) are much more likely to be compatible with one another than non-framework mods. This is because those APIs are created specifically to help prevent mods from conflicting with one another. (However, it's still possible — even easy — to create conflicts.)

Mods which use patchers are also somewhat more likely to be compatible with other mods if installed last. (Patchers work by replacing small bits of Minecraft's code rather than entire files.) However, patchers are few and far between.

The best rule-of-thumb indicator of whether two mods will conflict is to compare the list of .class files they contain. If there are no files which exist in both mods, chances are good that they'll work just fine together. If there are one or more files which exist in both, however, there will very likely be a conflict.

Finally, you can check the mods' documentation to see if they have notes about compatibility. Sometimes, there will be special instructions for getting two mods to work together which otherwise conflict or descriptions of what functionality the conflict will break. (e.g. TooManyItems and Convenient Inventory; ControlPack and OptiMine)

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Single-Player Commands + Aether dependecies do not work :( i really wanted to play Aether... –  Joe the Person Aug 19 '11 at 0:46
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