Thanks! I didn't even need to change anything in the makefile, mingw64 compiled it & it works now, at least with my VS Code debugger. I got a .png to display and .mp3 to play using raylib. The only thing I didn't get to work was the password. Is my syntax wrong? I put this into my command prompt to create the .dat:
respack list.txt Y4Dti74#@4
Then put "Y4Dti74#@4" as the 2nd field in ResPack_Open.