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I'm trying to get a functioning information center working and we don't really use MS products (except 365/teams/outlook). I just want to make sure I should not use Sharepoint if it's going to require an entire agency to download an app they wouldn't use and probably don't want to use.
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SharePoint does not require IE (which is being removed completely next year) nor Edge. It runs well on any chromium-based browsers including Edge, Chrome and Brave. The system requirements for SharePoint are provided here.
Then what is a .mht file? My assumption was it's a proprietary format that only opens in IE or the new chromium IE. I'm trying to build an easy-to-use information center and clicking on Teams links opens a hosted .mht file and clicking on "conversations" opens Outlook in a browser. I was expecting the Teams link to open that teams conversation in Teams and "conversations" also seems link it would open that conversation in teams. It's all behaving like it's broken. Basically, if this is how it's supposed to work, then I can't use it.
File extensions aren't that meaningful in the web world. What matters is the MIME type of the file. That is what the browser (all browsers) use to determine how to handle the file. Some browsers may be aware of MIME types that other browsers aren't but all of them allow you to map to applications. Edge/IE tends to do that for MS-specific MIME types but other browsers can as well.
An MHT file is a MHTML document. On my version of Windows 10 it is mapped to IE but you can map it to any browser you want. Now what the browser will do with that app I don't know. SharePoint hosts all sorts of files so I don't know exactly where in your Sharepoint system you're seeing .MHT files. I would recommend you change the file type mapping in Windows (Default Apps -> Choose default apps by file type) to, say, Chrome and see what it does. If it is just a regular old HTML file then it should open fine.
Your original question was whether SharePoint works in other browsers and it does. Your concern now is whether specific file types work in all browsers and unfortunately that is a case by case basis. You'll just have to play around with each of them. I don't see any 'conversations' protocol or file type but I assume it'll use the default browser on the machine. You could point it to Teams instead using the earlier app and see if it behaves correctly.
Got it thanks for the clarification. Yeah there's no way we can expect an organization to map unusual file types themselves -- especially since it is in a browser and is downloaded. It's basically suggesting the user or the developer did something wrong, and it's too late for IT to map file types to specific programs. UX is just too important to designers and developers especially since most of the web functions fine without proprietary MS hacks. I think we'll just use the wiki page in Teams and try to convince our parent company that MS's tools are inappropriate for our needs.
I told my boss Sharepoint is a dead end because the UX is ridiculously bad and unintuitive. Hosting a .txt file on a local server is better than this.