This is too shortsighted by the archival standards. Even Word itself doesn't offer full compatibility. VB? 3rd party active components? Other Office software integration? It's a mess. HTML and other web formats are only readable by the virtue of being constantly evolved while keeping the backwards compatibility. It will be pruned sooner or later, due to the tech debt or being sidestepped by something else. And I'm pretty sure there are plenty of obscure PDF features that will prevent many documents from being readable in mere half a century. I'm not even starting on the code and binaries. And cloud storage is simply extremely volatile by nature.

Even 50 years (laughable for a clay tablet) is still pretty darn long in the tech world. We'll still probably see the entire computing landscape, including the underlying hardware, changing fundamentally in 50 years.

Future-proofing anything is a completely different dimension. You have to provide the independent way to bootstrap, without relying on the unbroken chain of software standards, business/legal entities, and the public demand in certain hardware platforms/architectures. This is unfeasible for the vast majority of knowledge/artifacts, so you also have to have a good mechanism to separate signal from noise and to transform volatile formats like JPEG or machine-executable code into more or less future proof representations, at least basic descriptions of what the notable thing did and what impact it had.

>Future-proofing anything is a completely different dimension. You have to provide the independent way to bootstrap, without relying on the unbroken chain of software standards, business/legal entities, and the public demand in certain hardware platforms/architectures. This is unfeasible for the vast majority of knowledge/artifacts, so you also have to have a good mechanism to separate signal from noise and to transform volatile formats like JPEG or machine-executable code into more or less future proof representations, at least basic descriptions of what the notable thing did and what impact it had.

I'd argue that best way would be to not do that but to make sure format is ubiquitous enough that the knowledge will never be lost in the first place.

That, and use formats which can be accessed and explained concisely, like "read the first X bytes to metadata field A, then read the image payload by interpreting every three bytes as an RGB triplet until EOF" so that the information can be transmitted orally, in the off chance that becomes necessary

Hey I think I just described Windows 3.0-era PCX format :P

> HTML and other web formats are only readable by the virtue of being constantly evolved while keeping the backwards compatibility, which is nowhere near complete and is hardware-dependent (e.g. aspect ratios, colors, pixel densities).

HTML itself is relatively safe, by virtue of it being based on SGML. Though it's not ideal either because those who think it's their job to evolve HTML don't bother to maintain SGML DTDs or use other long established formal methods to keep HTML readable, but believe a hard-coded and (hence necessarily) erroneous and incomplete parsing description the size of a phone book is the right tool for the job.

Let me quote the late Yuri Rubinski's foreword to The SGML Handbook outlining the purpose of markup languages (from 1990):

> The next five years will see a revolution in computing. Users will no longer have to work at every computer task as if they had no need to share data with all their other computer tasks, they will not need to act as if the computer is simply a replacement for paper, nor will they have to appease computers or software programs that seem to be at war with one another.

However, exactly because evolving markup vocabularies requires organizing consensus, a task which W3C et al seemingly weren't up to (busy with XML, XHTML, WS-Star, and RDF-Star instead for over a decade), CSS and JS was invented and extended for the absurd purpose of basically redefining what's in the markup which itself didn't need to change, with absolute disastrous results for long-term readability or even readability on browsers other than from the browser cartel today.

> Though it's not ideal either because those who think it's their job to evolve HTML don't bother to maintain SGML DTDs or use other long established formal methods to keep HTML readable, but believe a hard-coded and (hence necessarily) erroneous and incomplete parsing description the size of a phone book is the right tool for the job.

> a task which W3C et al seemingly weren't up to (busy with XML, XHTML

You realise XML/XHTML is actually delightfully simple to parse compared to WHATWG HTML?

While it's true that these standards are X years old, the software that encoded those formats yesteryear is very different from the software that decodes it today. It's a Ship of Theseus problem. They can claim an unbroken lineage since the distant future, the year 2000, but encoders and decoders had defects and opinions that were relied on--both intentionally and unintentionally--that are different from the defects and opinions of today.

I have JPEGs and MP3s from 20 years ago that don't open today.

Are they really JPEGs and MP3s, or just bitrot?

I've found https://github.com/ImpulseAdventure/JPEGsnoop useful to fix corruption but I haven't come across a non-standard JFIF JPEG unless it was intentionally designed to accommodate non-standard features (alpha channel etc).

I personally never encountered JPEGs or MP3s which were totally unreadable due to the being encoded by ancient software versions, but the metadata in common media formats is a total mess. Cameras and encoders are writing all sorts of obscure proprietary tags, or even things like X-Ray (STALKER Shadow of Chernobyl game engine) keeping gameplay-relevant binary metadata in OGG Vorbis comments. Which is even technically compliant with the standard I think, but that won't help you much.

> X-Ray (STALKER Shadow of Chernobyl game engine) keeping gameplay-relevant binary metadata in OGG Vorbis comments

Just, ew

In the case of individual files with non-conformant or corrupted elements it seems fairly straightforward project to build an AI model that can fix up broken files with a single click. I suspect such a thing will be widely-accessible in 10 years.

There is something called Lindy Effect, which states that a format's longevity is proportional to its current age.

I try to take advantage of this by only using older, open, and free things (or the most stable subsets of them) in my "stack".

For example, I stick to HTML that works across 20+ years of mainstream browsers.

I can't help but think bad thoughts whenever I see another "static site maker" posted on here, or a brand new way of using JavaScript to render a web page.

Talk about taking the simplest and most durable of (web) formats and creating a hellscape of tangled complexity which becomes less and less likely to be maintainable or easy to archive the more layers of hipster js faddishness you add...

Just going to mention Pro/E forward compatibility here: https://youtu.be/tY_Gy-EElc0

"The roots of Creo Parametric. Probably one of the last running installations of PTC's revolutionary Pro/ENGINEER Release 7 datecode 9135 installed from tape. Release 7 was released in 1991 and is - as all versions of Pro/ENGINEER - fully parametric. Files created with this version can still - directly - be opened and edited in Creo Parametric 5.0 (currently the latest version for production).

This is a raw video, no edits, and shows a bit of the original interface (menu manager, blue background, yellow and red datum planes, no modeltree).

Hardware used: Sun SparcStation 5 running SunOS 4.1.3 (not OpenWindows), 128MB RAM

Video created on january 6, 2019."

That is great! NX has similar compatibility, though not quite as good.

In some cases, the actual version code of a feature is invoked by that data being encoded as part of the model data schema.

Literal encapsulation in action. That way bugs and output variances are preserved so that the regenerated model is accurate to what the software did decades ago.