I was going to examine the UnrealPak source but couldn’t find it in 4.1. I know it existed in 4.0.
Anyways, I then searched for all *.cpp files to see if it was moved, but none show up at all… there’s no engine source in there, no VS solution/project files and GenerateProjectFiles.bat isn’t in 4.1 either. I think it’s just precompiled with the headers supplied.
I realize it’s something I’m missing, but what?