Save location:
C:\Users\(username)\AppData\Roaming\Strive for Power 2\saves
Save files .sav can be opened with any text editor, such as notepad++ and then you can edit pretty much anything, although it's usually not easy to find.
If there is some save editor app, please share.
Hope this helps.
I recommend just using saveeditonline.com, it handles these save files just fine.
The structure of the save is a bit wonky at first, but not too bad if you have a basic understanding of what you're looking at. I'd recommend not touching anything quest related unless you know what you're doing, however.
And for anyone interested, the more useful cheats involve tweaking some of the other game files.
.\src\core\variables.gd
- Lots of fun stuff. Change the max population and population increase per upgrade. Change how long preg/training lasts. Age or virginity ratios. Starting stat points for player and starter slaves. Also the base HP/Mana, min/max factors, and a bunch of other stuff.
.\assets\data\pregen_characters_data.gd
- Base stats for all named characters
worlddata.gd
- Modify all the shop inventories
races.gd
- Modify all the base stats for races, just in case you want one to be super OP or something
names.gd
- Hopefully you can figure this one out without me explaining