If you opened an XDF file and it appeared as gibberish, that's not normal. I'm on Windows 7, and tried opening the $EE XDF I commonly use (EEXTRA v0[1].001[MOD_V0005_03_02]V6_3.xdf) in both Notepad and Notepad++. In both cases, it opened as a normal text file, as is to be expected. I have attached a screenshot for reference. My XDF is ~1MB in size.
The file dzidaV8 posted is just the water pump patch. If you select it as your XDF in TunerPro, you will only have two options available--installing the patch, and setting the minimum coolant temperature threshold to shut off the electric water pump after the engine has been shut off.
If you want to add those two items to your existing XDF, you would first need to figure out what's going on with said XDF to prevent you from opening it like a normal text file. Perhaps Notepad++ will work better for you. I can't say.
However, if all you want to do is add the electric water pump patch to your bin, you can just use the XDF that got posted to do it, then switch back to your preferred XDF when you're done.
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