Dave Plummer worked as a programmer at Microsoft in the 1990s. He wrote the Smart Drive CD-ROM cache and DISKCOPY. He also invented and wrote the first version of Task Manager. He just posted a video about his latest project:

Are you sick of windows getting just a little fatter every single year? Tired of apps that need an account, a cloud sync, and 30 background services just to open a damn text file? Well grab a seat, because today I’m actually doing something about it.

He built a modern version of notepad.exe with the same features as were present in the Windows XP-era version, and called it TinyRetroPad.

The final executable size is only 2.5 kb. That’s smaller than the default size for a single disk cluster in NTFS (i.e. the smallest unit of disk space that
can be allocated). It’s the same amount of disk space as the audio that goes along with a single frame of his video.