Windows 10 向我们介绍了全新的精美照片^{(Photos )}应用程序，作为其默认程序，用于与我们计算机系统上的图像格式文件进行交互。毫无疑问，照片^(Photos)是一个非常复杂的应用程序，但它在某些地方缺乏永久Windows应用程序（即Windows 照片查看器^{(Windows Photo Viewer)}）提供的绝对速度和简单性。

如果你还怀念这个应用程序早期的卑微体验，你可以恢复它。但是在Windows 10^{(Windows 10)}上使用此应用程序存在某些问题，我们将在本指南中重点介绍其中一个问题。

正常行为

在文件夹中选择多个文件、右键单击并选择预览时——正常行为应该是什么？

该应用程序应打开一个窗口，允许用户使用箭头键循环浏览所选的一组图像。这是此应用程序预期的普遍接受的行为，但是，有时照片查看器会在^{(Photo Viewer)}Windows 10上遇到多个实例问题。

简而言之，以前在选择和预览多个文件时在单个窗口实例中打开图像的照片查看器现在将为每个选定的图像打开单独的窗口。

照片查看器的多实例问题主要出现在Windows 10操作系统中。在大多数情况下，当照片查看器应用程序未在Default Apps/programs中注册时会发生这种情况。

在Windows 10中，Photo Viewer不再注册到默认程序^{(Default Programs)}中，未将应用程序设置为默认^(Default)应用程序和程序的用户可能会遇到此问题。当用户使用标准“打开方式...”设置图像文件关联时。对话框并选择照片查看器，问题以多个图像窗口的形式弹出。

Windows 照片查看器^{(Windows Photo Viewer)}在预览图像时打开多个实例

有两种解决方案：

1. 将^(Set)Windows 照片查看器^{(Windows Photo Viewer)}设置为默认图像查看器
2. 修复注册表项

让我们更详细地了解这些解决方案。

1]将^(Set)Windows 照片查看器^{(Windows Photo Viewer)}设置为默认图像查看器

让您信任的旧照片查看器恢复为Windows 10上的默认 照片查看器^{(Photo Viewer)}非常简单。跟着这些步骤：

1. 从“开始菜单^{(Start Menu)}”转到“控制面板^{(Control Panel)}”。
2. 现在从选项中，单击“默认程序^{(Default Programs)}”。
3. 在下一个窗口中，在“选择 Windows 默认使用的程序^{(Choose the programs that Windows uses by default)}”选项下，单击“设置默认程序^{(Set Your Default Programs)}”。
4. 您应该将当前的默认照片查看器视为照片^(Photos)应用程序。
5. 在这里，单击照片应用程序以查看^(Photos)照片查看器^{(Photo Viewers)}的扩展选项列表，选择“ Windows 照片查看器”。^{(Windows Photo Viewer’.)}

这会将Windows 照片查看器^{(Windows Photo Viewer)}设置为您的默认照片查看器^{(Photo Viewer)}程序。您现在可以退出设置；您的照片现在将在Windows 照片查看器^{(Windows Photo Viewer)}中打开。

如果多实例问题仍然存在，请检查是否已解决移动到下一个解决方案。

2]修复注册表项

使用注册表项^{(Registry Keys)}的简单文件类型关联设置可以帮助解决此问题：

单击“开始”^(Start’)并在搜索字段中输入“ Regedit” 。

当用户帐户控制^{(User Account Control)}提示您同意允许该程序进行更改时，单击“是”^(Yes’)按钮。

现在，导航到以下注册表^(Registry)项路径并修改值名称为 ' Clsid'的字符串，双击它并将 'Value Data' 更改为{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}.

Path 1 - HKEY_CLASSES_ROOT\bmpfile\shell\open\DropTarget 

Path 2 - HKEY_CLASSES_ROOT\jpegfile\shell\open\DropTarget

Path 3 - HKEY_CLASSES_ROOT\pngfile\shell\open\DropTarget

Path 4 - HKEY_CLASSES_ROOT\giffile\shell\open\DropTarget

单击“确定”^(OK’)以确认对字符串的编辑。

重启^(Reboot)系统。

请注意^{(Please note)}– 如果默认情况下不存在DropTarget子项，用户将需要在上述每个注册表路径中创建一个。

照片查看器打开多个实例的问题不应解决。

Windows Photo Viewer opens multiple instances when previewing images

Windows 10 intrоduced us to the all-new and pоlished Photos app as its default program for interacting with image format files on our computer systems. Unquestionably, Photos is a very sophisticated application, but it somewhere lacks the sheer speed and simplicity offered by the perpetual Windows app – i.e. Windows Photo Viewer.

If you still miss the humble experience of this application from earlier days, you can restore it. But there are certain problems with using this application on Windows 10, we shall highlight one of them in this guide.

Normal behavior

On selecting multiple files in a folder, right-clicking, and selecting preview – What should be the normal behavior?

The app should open one single window allowing the user to cycle through the chosen set of images using arrow keys. This is the generally accepted behavior expected from this application, however, sometimes Photo Viewer encounters multiple instances issue on Windows 10.

In simple words, the photo viewer that previously opened images in a single window instance when multiple files were selected and previewed, would now open separate windows for every selected image.

The multiple instances issue with the photo viewer is mostly seen in the Windows 10 operating system. In most cases, it occurs when the photo viewer app is not registered with Default Apps/programs.

In Windows 10, Photo Viewer is no longer registered with the Default Programs, and users who have not set the app as their Default app and programs are likely to face this issue. When users set image file associations using the standard ‘Open with….’ dialog and choose the photo viewer, the problem pops up in the form of multiple image windows.

Windows Photo Viewer opens multiple instances when previewing images

There are two solutions to this:

1. Set the Windows Photo Viewer as a default image viewer
2. Fix the Registry key

Let us look at these solutions in more detail.

1] Set the Windows Photo Viewer as your default image viewer

It is very simple to get your trusted old photo viewer back as your Default Photo Viewer on Windows 10. Follow these steps:

1. From the ‘Start Menu’ go to the ‘Control Panel’.
2. Now from the options, click on ‘Default Programs’.
3. In the next window, under the ‘Choose the programs that Windows uses by default’ option click on ‘Set Your Default Programs’.
4. You should see your current default photo viewer as the Photos App.
5. Here, click on the Photos app to view the expanded list of options for Photo Viewers, select ‘Windows Photo Viewer’.

This will set Windows Photo Viewer as your default Photo Viewer program. You can now exit settings; your photos will now open in the Windows Photo Viewer.

Check if the multiple instance issue is resolved if it persists move to the next solution.

2] Fix the Registry key

A simple file type association setting with the Registry Keys can help in fixing this issue:

Click ‘Start’ and enter ‘Regedit’ in the search field.

Click on the ‘Yes’ button when the User Account Control prompts you to agree to allow this program to make changes.

Now, navigate to the following Registry key paths and modify the string where the value name is ‘Clsid’, double click on it and change ‘Value Data’ to {FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}.

Path 1 - HKEY_CLASSES_ROOT\bmpfile\shell\open\DropTarget 

Path 2 - HKEY_CLASSES_ROOT\jpegfile\shell\open\DropTarget

Path 3 - HKEY_CLASSES_ROOT\pngfile\shell\open\DropTarget

Path 4 - HKEY_CLASSES_ROOT\giffile\shell\open\DropTarget

Click ‘OK’ to confirm the edits of the string.

Reboot System.

Please note – If the DropTarget subkey is not present by default, the user will need to create one in each of the registry paths mentioned above.

The problem of the photo viewer opening multiple instances should not be resolved.

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