I can’t remember the extensions... but, ya, I started BBSing (and FTPing) around 1980 (maybe between 1980-1984).
Third PC was the first one with DOS (first 2 had assembly/machine and Basic.. and the 1st one, I had to save onto a cassette recorder, along with a 300 Baud phone-cradle modem X^p ).
Never liked Winblows, but hated Apple more; wanted to stick with DOS, since very few could mess with my PC ;^)
I stick mainly with Linux KDE now.
Yep, I was a C-64 man myself. You could do a lot with 64k. In the office we went for Xenix on a Tandy 6000 (basically a Unix machine). I had 10 terminals hanging on that thing, using spreadsheet, word processor and database programs on the server. The whole setup was about $10k, a lot cheaper than networking PCs, which were selling for about $3k apiece at the time.