MinGW-w64 mentioned this in the v4 changelog:
"Experimental printf changes - Ability to print 128bit integers (%I128*) and Decimal Floats (%H, %D), disabled by default. Build the CRT with --enable-experimental to use."
How do I enable this? What is the "CRT"?
I haven't figured anything out yet. I'm using the WinLibs version of MinGW w64.