Microsoft Edge Chromium被设置为在Windows 10中打开和查看PDF文件的默认PDF 阅读器^{(PDF reader)}。因此，每当我尝试在Windows 10中打开任何^{(Windows 10)}PDF文件时，它都会自动在Edge浏览器中打开，尽管我的首选是Acrobat Reader。此外，当我尝试更改设置时，浏览器会劫持它并再次使用其旧行为。虽然许多人不会反对这一举措，但我相信，它并不适合所有人。因此，以下是阻止Edge更改PDF查看器关联的方法。

阻止 Edge^{(Stop Edge)}劫持PDF/HTML关联

观察到更改是由文件类型的文件关联^{(File Association)}重置触发的，这会恢复 Windows 10 的默认设置。但是，为什么每次用户重新启动 PC 时PDF FileAssociations都会被重置。^{(FileAssociations)}

好吧，FileAssociation的功能团队解释说，它在^{(FileAssociation)}Windows 10中的保护机制可防止对每种文件类型的注册表的UserChoice区域进行直接更改。因此，如果在注册表中未配置FileAssociation，或者如果应用程序通过错误地写入UserChoice注册表项来设置关联而使哈希无效，则会触发该文件类型的FileAssociation重置，从而恢复默认状态。^{(FileAssociation)}因此^(Hence)，我们需要编辑一个注册表项。

这是PDF/HTML文件类型不断重新分配给Microsoft Edge浏览器的解决方案。

微软边缘铬

如果您发现PDF文件在Edge浏览器中自动打开而无需下载，则需要调整设置。它将阻止Edge浏览器成为默认的PDF阅读器。这是它是如何完成的！

打开 Microsoft Edge 浏览器。

单击右上角^{(Click Settings)}的设置等。

选择设置并转到Cookie 和站点权限^{(Cookies and site permissions)}，如上图所示。

切换到右侧并向下滚动到所有权限^{(All permission)}部分。

在它下面，找到PDF 文档^{(PDF documents)}条目。

现在，将始终下载 PDF 文件^{(Always download PDF files)}选项的开关切换到关闭^(Off)位置。

完成后，关闭浏览器并重新启动它。

Microsoft Edge 旧版

打开“运行”对话框，输入“Regedit”并点击“确定”按钮。接下来，导航到以下键 -

HKEY_CURRENT_USER\SOFTWARE\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Repository\Packages\Microsoft.MicrosoftEdge_25.10586.0.0_neutral__8wekyb3d8bbwe\MicrosoftEdge\Capabilities\FileAssociations

请^(Please)注意，在以Microsoft.MicrosoftEdge开头的键下，地址在某些版本的^{(Microsoft.MicrosoftEdge)}Windows中可能不同。

例如，就我而言，它是-

 Microsoft.MicrosoftEdge_42.17134.1.0_neutral_8wekyb3d8bbwe

找到后，只需展开这个键和它下面的其他键。然后，选择FileAssociations并查看屏幕右上角提供的条目。

仔细观察为^(Observe).pdf名称显示的数据^(Data)字符串。

在撰写本文时，字符串是 this，但在您的情况下可能会有所不同-

AppXd4nrz8ff68srnhf9t5a8sbjyar1cr723

右键单击^{(Right-click)}上述条目并从显示的菜单中选择重命名选项。^(Rename)

之后，在名称末尾添加下划线字符，然后按Enter保存新名称。

完成后，导航到控制面板^{(Control Panel)}并打开默认程序小程序以配置更改，即选择不同的应用程序作为PDF文件的默认应用程序。

从现在开始，Edge不应将自身重新安装为默认应用程序。

如果您希望将此设置更改为原始设置并恢复较早的体验，只需从键名中删除下划线字符 -

AppXd4nrz8ff68srnhf9t5a8sbjyar1cr723

如果Windows不允许您编辑注册表^(Registry)项，您可能需要以管理员身份运行 regedit 并获得注册表项的所有权^{(take ownership of the Registry key)}。

希望这可以帮助！

Stop Edge from hijacking your PDF/HTML file associations

Microsoft Edge Chromium is set as the default PDF reader to open and view PDF files in Windows 10. So, whenever I attempt to open any PDF file in Windows 10, it automatically gets opened in Edge browser, although my preferred choice is Acrobat Reader. Moreover, when I try to change the settings, the browser hijacks it and resorts to its old behavior again. While many would not oppose this move, I believe, it’s not intended for everyone. So, here’s how you can stop Edge from changing the PDF viewer association.

Stop Edge from hijacking PDF/HTML associations

The change is observed to be triggered by a reset of File Association for a file type, which restores Windows 10 defaults. But, why do PDF FileAssociations get reset every time a user restarts his PC.

Well, The feature team for FileAssociation explains that its protection mechanism in Windows 10 prevents direct changes to the UserChoice area of the registry for each file type. As such, when no FileAssociation is configured in the registry or if an application makes the hash void by incorrectly writing to the UserChoice registry key to set associations, a reset of FileAssociation for that file type gets triggered, restoring default status. Hence, we need to edit a registry entry.

Here is the solution to the PDF/HTML file type being continually reassigned to Microsoft Edge browser.

Microsoft Edge Chromium

if you find that PDF files open automatically in the Edge browser without downloading them, you’ll need to tweak a setting. It will prevent the Edge browser from being the default PDF reader. Here’s how it’s done!

Open Microsoft Edge browser.

Click Settings and more from the upper-right corner.

Select Settings and go to Cookies and site permissions as shown in the image above.

Switch to the right side and scroll down to the All permission section.

Under it, locate the PDF documents entry.

Now, toggle the switch for the Always download PDF files option to the Off position.

When done, close the browser and re-launch it.

Microsoft Edge Legacy

Open the ‘Run’ dialog box, type ‘Regedit’ and hit ‘Ok’ button. Next, navigate to the following key –

HKEY_CURRENT_USER\SOFTWARE\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Repository\Packages\Microsoft.MicrosoftEdge_25.10586.0.0_neutral__8wekyb3d8bbwe\MicrosoftEdge\Capabilities\FileAssociations

Please note that, under the key that starts with Microsoft.MicrosoftEdge the address could be different in some versions of Windows.

For instance, in my case it was-

 Microsoft.MicrosoftEdge_42.17134.1.0_neutral_8wekyb3d8bbwe

When found, simply expand this key and others under it. Then, choose FileAssociations and look at the entries provided in the right corner of the screen.

Observe closely the Data string displayed for the .pdf name.

At the time of this writing, the string is this, but it may be different in your case-

AppXd4nrz8ff68srnhf9t5a8sbjyar1cr723

Right-click on the above entry and select the Rename option from the menu displayed.

After that, add the underscore character to the end of the name and press Enter to save the new name.

When done, navigate to Control Panel and open the Default Programs applet to configure the change, i.e., choosing a different application as the default application for the PDF files.

From now on, Edge should not reinstall itself as the default application.

Should you wish to change this setting to original and restore the earlier experience, simply remove the underscore character from the name of the key-

AppXd4nrz8ff68srnhf9t5a8sbjyar1cr723

If Windows does not allow you to edit the Registry key, you may need to run regedit as admin and take ownership of the Registry key.

Hope this helps!

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