What is MHT or MHTML? MHT or MHTML, short name for MIME HTML, is used as the file extension for MIME HTML files. .MHT or .MHTML files are text files that can be opened by Notepad or any text editors. See the sample .MHT file included below.

File Extension: .MHT or .MHTML

MIME Type: multipart/related

File Content: MIME HTML Web page

.MHT or .MHTML files are MIME HTML files, which contrains HTML Web pages with their resource files encoded in MIME format. A .MHT or .MHTML file is also called Single File Web Page file or Web Archive file. Here is a sample .MHT file containing some simple Web page with an small image:

MIME-Version: 1.0
Content-Type: multipart/related;
	boundary="----=_NextPart_000_0005_01CD5943.8A1C3E00"
This is a multi-part message in MIME format.

------=_NextPart_000_0005_01CD5943.8A1C3E00
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
Content-Location: file:///C:/sample.html


 =
Welcome=20
to FYIcenter.com! 

------=_NextPart_000_0005_01CD5943.8A1C3E00
Content-Type: image/x-icon
Content-Transfer-Encoding: base64
Content-Location: file:///C:/favicon.ico

AAABAAEAEBAAAAAAAABoBQAAFgAAACgAAAAQAAAAIAAAAAEACAAAAAAAQAEAAAAA
AAAAAAAAAAAA////AKuxOgCOzdAATIUIAPLfkgBTn3IAscd7AL/r/wCJlhgAVJE5
///bAGeuiwCqul0AZaJYAIWjNADi+P8AXJAdAKrMmgB0jB4AZpgvAEyEJAC3s04A
tVIAtuP5AFWXRQC3tkEAX51OAGSNFABWiBYASIcTAGOVJACyypMAXJUvAEyUQQD1
...

------=_NextPart_000_0005_01CD5943.8A1C3E00--

.MHT or .MHTML file sample: Click sample.mht to download.

.MHT or .MHTML files can be created and modified by these software:

• Microsoft Internet Explorer - Opens and creates .MHT or .MHTML files
• Google Chrome - Opens and creates .MHT or .MHTML files