although it's little more than an HTML variant, I can't recall any alternatives for that effect...
Not sure if you were referring to the viewer, or the format. If the format, MAF (Mozilla Archive Format) is the only other format that I can think of similar to MHT. It's open source - but as far as I know, there is only an add-on for Firefox:
https://addons.mozilla.org/en-us/firefo ... ve-format/
The spec of the format is on the website, but it is essentially based on zip, so if you can't find a browser to open it, you can always rename it to .zip and use any archiver that supports .zip to view the contents. It does a good job, and I have found that on some webpages which MHT fails on (I use UnMHT to save my MHT files), MAF succeeds. Still, I continue to favour MHT though.
If the viewer, there are some: Firefox (of course, but you need an add-on), Internet Explorer (surprisingly, handles it natively), the Lister component of Total Commander with the HTMLview plugin installed (this really just calls IE to view HTML files), and also Universal Viewer (http://www.uvviewsoft.com/
). That has a free version - which lags a long way behind the paid version unfortunately - and can be used in Total Commander. However I no longer trust it, due to some fairly suspicious behaviour it exhibited when I used to have it installed. There are also a number of other Total Commander plugins that can unpack the content from MHT files (though not view them direct). I currently use Lister with HTMLview, but I really want something else, as there are some MHT files that cause Lister to instantly hang, taking Total Commander with it.
I save a lot of content on a daily basis to MHT format, so what I wouldn't give for a small, simple (only has one function), fast to load MHT viewer. My attempts to find such a thing though have been fruitless.