As far as I know, there are only 18 colors that you can define. You can set the (using the color tab of the chart).
If you now load make sure the values are loaded in the right order, you can effectively set the colors for each value.
Alternatively (but never done this myself) you can load the RGB value (as one number or 3 numbers) as a value in your data model and read those into an expression that will than result in the related color.
Don't allow Perfection to be the enemy of Good Enough. May you live in interesting times!
This might be what Onno means, you could always define your colors as variables and load these into QlikView. I would probably define my 100 RGB codes in a text file and then use an include statement in the script to load them.
LET vLightGreen = RGB(187,216,84); LET vMysteryBlue = RGB(121,165,212);
And so on...
This wont create a palette so you will have to manually assign the variables but you can reuse the text file in multiple Qlikview documents. Maybe not what you wanted but as Onno mentioned as far as I know we can only pre-define 18 colors in the actual palette