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Grinding is gross though.
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You can theoretically combine assets without compatibility issues.
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<Snipped quote by Meta>
^This
>uses the caret and "this" in the same post
In that case, it should be totally possible. Just find where the assets are stored in 1.6.4, find where they're stored in 1.7.10, see if you can figure out the pattern, and inject the assets. After the first three steps I outlined, if you believe the assets rely on file names or that their positions must be specified by code, find out how to decompile the *.jar. Then you can search through the code. Using the Windows search function to find a particular filename should work if you believe it relies on file names. Then you can figure out the pattern for the code and work from there.