I need to recreate the gradient settings in letters in Adobe Illustrator (below you can find one example letter in .ai file). Is it possible?
I do not know this program very well (normally I'm using only Photoshop). I can not find in AI any settings anywhere that contain gradient parameters.
This particular example was done with a light colored shape above the other one which is semi-transparent with a gradient on it.
That produces the effect
This will make a copy of your letter into a path which you can apply gradients to.
The gradient should be a composed of 2 sliders of the same lighter color and should have 0% opacity on one slider, and a higher (not 100%) on the other.
If you also want that outlined effect, you can select your path and go to Object→Path→Offset Path and do -2 and hit ok.
Note, you will have to ungroup it and delete the first one, as offset path will create an additional path.
I took a look at how the letterform G you had as an .ai file was structured, and found that I agree with @WELZ - it was layered elements on top of one another - all separate.
IMHO this is a non-optimal workflow in Illustrator, as it makes it hard to reproduce things.
My approach to this kind of thing is a bit different: I use the Appearance Palette, add new fills (in this case a white to transparent gradient) and set effects on them (such as Path>Offset with a -0.33 mm offset in this case) and set the appropriate opacity (screen at ~ 33) to get our required effect.
Once I have that prototyped correctly, I save it as a Graphic Style, and then apply that to new elements as I desire:
And in case it's not clear: one nice thing about the graphic style approach is you can apply it to multiple entities simultaneously, and it works pretty well irrespective of specific geometry, provided you've set your offsets correctly:
