This was a fun experience, I enjoyed the atmosphere and mystery and the experience of finding both endings. The sound design was used effectively and the general setup did keep me on edge for my first couple of playthroughs.
As you've mentioned in previous comments, things like extra sprites distinguishing files from folders would increase the overall quality, and I think adjustments like making the text fit the graphics in terms of style would make things more immersive. It could also be worth adding a few more nuances to the, OS such as having it recognize the difference between a non-existent file and a non-corrupted file.
The story has some really cool ideas, however it does feel like it's setting up for more than what gets fully explored, making this function as a brilliant teaser for a larger.
As far as (non-canonical) bugs go, the only one I've really noticed is when opening the diary for the second time, it kept saying the same thing and I couldn't close the dialogue window. I thought this might have been intentional, however when I tried it again , it just closed like what would be expected.
Overall a nice entry, that kept me invested for the afternoon!