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Asked: 2026-06-07T05:46:03+00:00

I have a mht-File which will not be shown in InternetExplorer 9. I have

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I have a mht-File which will not be shown in InternetExplorer 9. I have seen, that the text/html-part is encoded in base64:

Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: base64

Could this be the reason, that IE9 will not be able to show the MHT-File?

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1 Answer

  1. Editorial Team

    Internet explorer 9 can open such MHT files with no problem.

    Here are two files you can test with:

    See if you can open both of those files.

    You can also decode the base64 (for example, here: http://www.opinionatedgeek.com/dotnet/tools/base64decode/) and see what HTML it produces. If the base64-encoded data is corrupt, it may produce bad HTML that the browser cannot display.

    UPDATE: I looked at the MHT file linked in the comment below. It does not contain a valid HTML page in it and therefore it cannot be displayed in Internet Explorer.

    The original decoded HTML:

    <P style="MARGIN: 0cm 0cm 0pt" class=yiv1976172747msonormal><FONT size=3>
<SPAN style="FONT-FAMILY: Arial; COLOR: black; mso-bidi-font-weight: bold">
My name is Walther </SPAN><SPAN style="COLOR: black"><?xml:namespace prefix = o
ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=yiv1976172747msonormal><FONT size=3><SPAN
style="FONT-FAMILY: Arial; COLOR: black; mso-bidi-font-weight: bold">I have some
money to invest in your country</SPAN><SPAN style="COLOR: black"><o:p></o:p>
</SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><FONT size=3><SPAN
style="FONT-FAMILY: Arial; COLOR: black; mso-bidi-font-weight: bold">My email
</SPAN><B><SPAN style="FONT-FAMILY: Arial; COLOR: #ff6600">:</SPAN></B><FONT
face="Times New Roman"> </FONT></FONT><A href="mailto:dipl.george.walther@
hotmail.com"><SPAN style="TEXT-DECORATION: none; text-underline: none"><FONT
size=3 face="Times New Roman">dipl.george.walther@hotmail.com</FONT></SPAN>
</A><B><SPAN style="FONT-FAMILY: Arial; COLOR: #ff6600"><o:p></o:p></SPAN>
</B></P>

    When I removed the invalid tags added by Outlook (the <o:p> and similar) and added <html> and body tags around the whole thing, the MHT file opened correctly in Internet Explorer.

    In short, Outlook produces bad HTML and Internet Explorer doesn’t know how to read it.

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