Oh, fun times. I've been on the other side of that business in my past life, where I had to "revive" a business critical program written in VB3 (yes for Window

Oh, fun times. I've been on the other side of that business in my past life, where I had to "revive" a business critical program written in VB3 (yes for Windows 3.x) after a computer migration that was used to calculate the weight of an aluminum or steel coil/roll via its dimensions so it could be input into the PLC for the feeder mechanism at the beginning of a production line that did forming/extruding of metals. So on one end mainframes, on the other ends software written for DOS and Windows 3.x still being used in (at the time the 2010s) to keep critical infrastructure for manufacturing running.