Forum Discussion
Edge v93 - v96 opens .MHT Files but shows no content ("white page")
Recently Edge started to be the Default File-Type-Association for .MHT Files. But it seems the .MHT-File-Support is not implemented to Support true multipart/related MIME encapsulation of aggregate ...
Eric_Lawrence
Microsoft
MicrosoftGunnar-Haslinger Thank you for sharing the repro files; a support case was opened.
As you noted, Edge/Chromium's support for MHT files today is limited in various ways (less liberal parsing than IE, web form controls are disabled in MHT content, more restrictive same-origin-policy behavior).
Today, the best way to ensure IE-style rendering of MHT files is to use IE Mode. As of Edge 94, that should happen by default for MHTML files unless they contain metadata suggesting that they were saved from Edge mode to start with[1].
Thanks Eric_Lawrence for your reply.
Using IE-Mode is our current workaround and works fine.
But looking forward to see a more complete .mht Support in future Versions of edge to not depend on IE-Mode for this any more. The limitations you cited (same-origin-policy, ...) would not be a problem for us.
Some of the linked sample files just work when changing File-Endings (Unix/LF) to Windows/CRLF. But saved E-Mails (Plain/HTML-Alternative Multipart MIME) then still just show the Plain-Part and not the HTML-Part.
Using IE-Mode is our current workaround and works fine.
But looking forward to see a more complete .mht Support in future Versions of edge to not depend on IE-Mode for this any more. The limitations you cited (same-origin-policy, ...) would not be a problem for us.
Some of the linked sample files just work when changing File-Endings (Unix/LF) to Windows/CRLF. But saved E-Mails (Plain/HTML-Alternative Multipart MIME) then still just show the Plain-Part and not the HTML-Part.