I traced the source of your problem; this tool tries to be helpful and renames some .dat files to .txt after extracting them. You can't inject .txt files though, so you have to rename them back to .dat - the changes then appear in the game (yes, I tried).
So, let's suppose you have extracted this "68.....txt". Rename it to "68....dat", create a new folder "C: \pak", place paktool.exe, data.pak and this 68...dat inside and then run paktool from within this directory: "paktool /p data.pak ." (with the dot).
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