Or some ancient software they don't want to buy a new version of.Wonder if it was tied to a peice of equipment that they either can't, or don't want to, replace.
My dad got some photo organizing software that came with a digital camera back when he had a PC running Win98.
He insisted on installing that same software on every subsequent PC, even though it had an annoying tendency to change the registry when installed so that app would launch every time you clicked on the documents folder on every version of Windows through the '00s.
He got a new PC with Win11 a couple of months ago, so I'm really hoping he ditched that software for something else, or found a modern version at the minimum.