The famous thing that is said before a cliche disaster...
Try changing it and see what happens.
Also, https://powdertoy.co.uk/Discussions/Thread/View.html?Thread=1762
the original purpose of it was to separate saves from different "mods"
But... we can't upload saves from mod's....
ok so if i change it, it wouldn't affect the game in anyway.
ok so if i change it, it wouldn't affect the game in anyway.
I don't know, the last time I tried changing it was several years ago but I seem to remember it made most of the saves disappear from the save browser.
Try changing it and see what happens.
Edit: actually, don't bother. I've just checked and it seems to be entirely unused in TPT++, it's a leftover from when the game was written in C. Changing it will do nothing.
It seems obvious....it can only view saves with that call letter. Default is "G".