It kind of depends on the document format. PDF tends to display well over time (but there can be issues with complex documents and/or missing fonts), spreadsheets and word processor files are likely to be openable, but they may not display as they originally did. HTML is likely to look rather different than it did when written, but it'll probably be legible.

The main causes of incompatibility were the transition from ball-and-powder to rimfire cartridges, then the transition from rimfire to centerfire. It's surprising how little firearms have changed in the past century. 9mm Parabellum is 125 years old. The Browning short recoil action (used by most handguns today) is over a century old.

1. https://en.wikipedia.org/wiki/.22_short

you can do that, in fact I know that Austria still has a mid 19th century train in regular operation (https://de.wikipedia.org/wiki/SB_alt_23)

if you're looking for commuter trains a lot of early 20th century ones still operate around the world.

This quite literally happens all the time in the UK. There are heritage railways, and steam rolling stock regularly shows up on various routes as part of heritage rides.

On the other hand, I ride almost daily on a track bed that was laid almost 180 years ago, and through tunnels and on viaducts that are equally as old. The rails, sleepers, signals, and rolling stock have all changed, no doubt, but the base infrastructure is old hat.

The oldest bits of the London Underground are from 1863. The tunnels are exactly the same, the stations and stairways, and even some of the sign boards completely unchanged from then.

Railways are the epitome of forever infrastructure.