Thanks for looking at this, your _MEM solution works fine for me too.
I've worked with files somewhat, but I'm still pretty green at it, and was testing the efficacy of using PUT without the loop structure. The wiki seems to indicate that QB64 can do this, and my first inclination is to wonder what it is that I"M doing wrong.
To this point, I've always used UBOUND derived loops for array PUTs, and was investigating if I could save some keyboarding. Apparently, sometimes the longer road is the better route.