One of the primary purposes of TunerPro is to edit binary files. To do this, you must first load your binary file and its corresponding definition file.

To open the bin:

1. Via the menu, select File -> Open Bin or use the corresponding keyboard shortcut (Default is Ctrl + O)
2. Browse to the desired bin and double click it

To open the definition file:

1. Via the menu, select XDF -> Select XDF or use the corresponding keyboard shortcut (default is Ctrl + E)
2. Browse to the appropriate XDF file and double click it.

Opening the XDF file will enumerate the XDF Item tree with the available bin parameters available for editing. Once you have your bin and XDF file loaded, select the bin parameter you'd like to edit from the tree

A Note On Rounding

Many values in a bin are converted to real-world values by way of a calculation. When you change a calculated value in a TunerPro editor window and save it (or update it when emulating), the value is returned back to a byte (or 2 bytes if the item is 16 bits). If the value needs rounding, it is rounded to the nearest byte value (generally, the nearest unsigned integral value - e.g. 1, 2, 3, 4, ... 255).

You might notice that you changed the base timing to 6.71 and then saved it. Next time you opened it you noticed the value was 6.69 instead of your intended 6.71. This is a result of the rounding and is completely expected and completely normal. This has to do with the resolution of the final value after it is "reconverted".