Windows 10的文件资源管理器^{(File Explorer)}不支持.eml预览。例如，当您双击 .eml 文件时，它会在Outlook中打开，但预览窗格拒绝显示.eml 文件预览^{(.eml file preview)}- 而不是显示以下消息“预览不可用^{(Preview not available)}”。如果您希望此功能适用于Windows 10文件资源管理器中的^{(File Explorer)}EML文件，请使用名为PreviewHandlerEditor的免费工具。

^{(Preview .eml)}在Windows 资源管理器中^{(Windows Explorer)}预览 .eml文件

EML文件基本上是文件形式的电子邮件。打开它们的最简单方法是使用Microsoft Outlook^{(Microsoft Outlook)}等电子邮件客户端。如果您将文件从旧计算机复制到新计算机，因此无法再在预览窗格中预览单个EML文件的内容^(EML)Windows Explorer/File Explorer，请尝试以下操作。

预览处理程序关联编辑器

从MSDN下载 Preview Handler Association Editor并从 .zip 文件中提取其内容。它是一种工具，使用户可以轻松地编辑特定扩展的预览处理程序注册。所以，下载工具

接下来，通过双击PreviewHandlerEditor.exe 运行该工具。^{(PreviewHandlerEditor.exe.)}当应用程序加载时，它会彻底搜索所有已注册预览处理程序的注册表。加载与此相关的数据后，界面会显示一个组合框，允许您选择任何已注册的预览处理程序。

^(Scroll)在下拉框中向下滚动并找到Microsoft Windows Mail Mime Preview Handler^{(Microsoft Windows Mail Mime Preview Handler)}。

取消选中复选框，然后向下滚动以找到.eml - 标记与其关联的复选框，如下面的屏幕截图所示。取消选中选中的项目会导致它们立即取消注册为选定的预览处理程序。

您还可以选中“仅显示与此处理程序关联的类^{(Only show classes associated with this handler)}”复选框以过滤列表。这使得查看当前与所选处理程序关联的所有扩展/类变得更加容易。

检查未检查的项目会导致它们立即与选定的预览处理程序相关联。

现在，关闭PreviewHandlerEditor并找到保存的电子邮件（.eml 文件）。

单击已保存的电子邮件现在将在Windows 资源管理器预览窗格^{(Windows Explorer Preview Pane)}中显示预览。

如果用户正在处理 100 多个文件，因此该工具特别有用，因此无法单独打开每个文件来查看内容。但是，在Windows 资源管理器^{(Windows Explorer)}预览窗格中快速浏览它肯定有助于选择正确的文件或相对轻松地在它们之间来回切换。

从MSDN 博客^{(MSDN Blogs)}下载 PreviewHandlerEditor 。它包含在Microsoft Permissive License中。

How to preview EML files in Windows File Explorer

The File Explorer of Windows 10 does not support .eml previews. For instance, when you double-click on a .eml file, it opens in Outlook, but the preview pane refuses to display the .eml file preview – instead of displaying the following message “Preview not available”. If you would like to get this feature to work for EML files in Windows 10 File Explorer , use a free tool called PreviewHandlerEditor.

Preview .eml files in Windows Explorer

EML files are basically emails in file form. The easiest way to open them is to use an email client like Microsoft Outlook, etc. If you have files copied from your old computer to a new one and so no longer able to preview the contents of the individual EML files in the preview pane of Windows Explorer/File Explorer, try the following.

Preview Handler Association Editor

Download Preview Handler Association Editor from MSDN and extract its contents from the .zip file. It is a tool that makes it easy for users to edit preview handler registrations for particular extensions. So, download the tool

Next, run the tool by double-clicking PreviewHandlerEditor.exe. When the app loads, it thoroughly searches for the registry of all registered preview handlers. Once the data related to this is loaded, the interface displays a combo box allowing you to pick any of the registered preview handlers.

Scroll down in the drop-down box and locate Microsoft Windows Mail Mime Preview Handler.

Uncheck the checkbox and then scroll down to locate .eml – mark the checkbox associated with it as shown in the screenshot below. Unchecking checked items causes them to be immediately unregistered for the selected preview handler.

You can also check the “Only show classes associated with this handler” checkbox to filter down the list. This makes it easier to see all of the extensions/classes currently associated with the selected handler.

Checking items that aren’t checked cause them to be instantly associated with the selected preview handler.

Now, close the PreviewHandlerEditor and locate a saved email (.eml files).

Clicking on a saved email will now show a preview in Windows Explorer Preview Pane.

The tool is particularly useful if a user is working with 100+ files and so cannot afford to open each file individually to view contents. However, catching a quick glimpse of it in Windows Explorer preview pane can certainly help to pick the correct file or switch back and forth between them with relative ease.

Download PreviewHandlerEditor from MSDN Blogs. It’s covered by the Microsoft Permissive License.

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