Comment by necovek

That file name thing was from Win95 keeping DOS (FAT) compatibility by introducing FAT32/VFAT: long file names were truncated to standard 8.3 names from DOS (and by extension, Win3.11 too) with fs extensions used to store long file names alongside DOS names. Win95 would show long names, DOS would show shorter ones.

Also, file formats were binary optimized at the time, compared to current XML behemoths compressed with zip. So 12MB file in 1993 is probably something like 100k+ rows, and try that out today.