Which MIME types are related to file extension ".mhtml"?
The .mhtml file extension is associated with 3 MIME types:
message/rfc822, application/x-mimearchive, multipart/related.
A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.
About .mhtml Files
MHTML files are archive files that combine a complete web page into one file.
They embed HTML code, images, and style data so that the page works offline or can be shared as a single file.
They use several MIME types to describe their structure:
- message/rfc822: Often used for HTML email messages that include web content.
- application/x-mimearchive: Identifies the archived web page format.
- multipart/related: Ensures all page components are linked together properly.
They can be opened and viewed with browsers such as Internet Explorer and Microsoft Edge.
Some email clients may also handle these files if embedded HTML emails are stored this way.
Based on information from FilExt.com.
Relationship between file extension and MIME type
A file extension is a suffix at the end of a filename that indicates what type of file it is. File extensions help both users and operating systems identify what application should be used to open the file.
File extensions are typically separated from the filename by a period (dot) and consist of 2-4 characters, though they can be longer. For example, in the filename "document.pdf", ".pdf" is the file extension.
File extensions are closely related to MIME types, as they both serve to identify the format of a file. However, while MIME types are used primarily by web browsers and servers, file extensions are used by operating systems and applications.
Associated MIME types
message/rfc822, application/x-mimearchive, multipart/related
FAQs
How do I open an .mhtml file?
You can open MHTML files with most modern web browsers, including Google Chrome, Microsoft Edge, and Internet Explorer. Simply double-click the file, or right-click it and select "Open with" to choose your preferred browser. Since these files are web archives, the browser will render them exactly like the original webpage.
What is the difference between .html and .mhtml?
An HTML file usually saves only the text content and links to images stored in a separate folder. In contrast, an MHTML file combines the HTML code, images, CSS, and scripts into a single archive file (application/x-mimearchive), making it much easier to share or view offline without losing formatting.
How can I convert an MHTML file to PDF?
Open the MHTML file in a browser like Google Chrome or Microsoft Edge. Press Ctrl + P (or Cmd + P on Mac) to open the print dialog, change the printer destination to "Save as PDF", and click Save. This creates a portable document that looks identical to the archived webpage.
Why won't Firefox open my MHTML file?
Mozilla Firefox does not natively support the MHTML format by default and often requires a specific browser extension to view these files correctly. To view the file without installing add-ons, try opening it in a Chromium-based browser like Edge, Chrome, or Opera instead.
Can I edit an MHTML file in Microsoft Word?
Yes, Microsoft Word can open and edit MHTML files because the format is closely related to how Office handles embedded web content. However, complex layouts may shift or break during editing, so it is generally better to edit the source HTML if possible.
Are MHTML files safe to open?
While generally safe, MHTML files can contain malicious scripts or links just like a live webpage. Be cautious if you receive an unexpected .mhtml file via email, as it might be classified under message/rfc822 and used for phishing attempts. Always scan unknown files with antivirus software.
How do I create an MHTML file from a website?
In browsers like Chrome or Edge, right-click the page and select "Save As...". In the "Save as type" dropdown menu, choose "Webpage, Single File (*.mhtml)". This captures the current state of the page into one file for offline access.
What MIME type is used for MHTML files?
MHTML files generally use the MIME type multipart/related to indicate that the file contains multiple resources (like images and text) linked together. They may also be identified as application/x-mimearchive or message/rfc822 depending on the software context. You can verify specific type details at mime-type.com.
General FAQ
What is a MIME type?
A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.
MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.
MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.
How do I find the MIME type for a file?
You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.
Why can one extension have multiple MIME types?
Different programs and historical usage may assign various MIME identifiers to the same file format. Listing them together helps maintain compatibility across tools.