In the Photos app on your Mac, choose Photos > Preferences, then click General. Deselect the “Copy items to the Photos library” checkbox. Now, when you import photos or video, Photos leaves the files in their original location and accesses them as referenced files.

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1. Default Application To Open Files

The default image viewer on Mac is Preview, a stock macOS app that actually originated at NeXT. Preview does many things. On top of letting you view, edit, and annotate images and PDF documents, Preview can also import and export documents to various file formats. It is, for many, a staple.

1. Is there any way to make my application default to open certain file types(e.g from Mail app). In this moment it is opened by Preview by default and the application is listed in the Open in.
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Being a default photo viewer, Preview will launch automatically if you open any image or PDF document on your Mac. As useful as it is, some users with specific needs will find this behavior more of an annoyance than a helpful feature, and would like to default to other apps for opening images. For example, you might want to make Photoshop your default image viewer and editor. Or maybe you want Pixelmator to be that go-to app.

Fortunately, you can easily change the default image viewer on your Mac. This is how to do just that.

How to stop using Preview as the default photo viewer

Step 1: Click to select an image file you want to open with a different photo viewer or editor. Once it is selected, hit Command + I on your keyboard to bring up the Info panel. Alternatively, you can simply right click on the file, and select Get Info.

Step 2: The Info panel will open with various details about the image. Under the Open With dropdown menu, select the application you want to use as default. It could be Photoshop, or in my case, it is Pixelmator. Assuming you want to apply the change to all similar file types, click Change All to open all documents like this one with the selected application in the future.

Step 3: You will be asked to confirm the change. Click Continue.

Step 4: Depending on your needs, you might have to repeat the process with different file types. In our example above, we are just switching the default image viewer for JPG files, but you’ll need to repeat the process for other files such as GIF, PNG, PDF, etc, depending on your preferences, of course.

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You can just as easily revert back to Preview should you want to by simply following the steps above again.

The steps describe above work for any kind of files and applications. You can just as easily make specific file types open in specific apps.

More:Mac tips and tutorials.

When you choose a file, your Mac tends to open it with a default program, even if you have multiple programs that are designed to work with that type of file. The odds are that your HTML files will open in Safari, your text documents will open in Pages (or if you don’t have Pages installed, it will open in Text Edit) and your pictures will open with Preview. For most of us, that is a good thing, but it may not be for you. Maybe you want to edit your photos with a more advanced tool, instead of just viewing them. That means have to open each photo in the program before you can begin your work. Not exactly what anyone would call a convenient setup.

If you want to fix that, you are going to have to change your default programs. Don’t worry. That may sound really complicated at first, but with Leopard, or Snow Leopard, it is really quite simple. Just follow these steps and you will be up and changing your file associations in no time.
Let’s continue on with your example from above, and figure out how to make your images open in Photoshop instead of in Preview. This process will work for a variety of different programs and file types.

Step One: Find the File (or Files) You Wish to Change

Open the spotlight window by clicking on the magnifying glass icon on the top right hand side of your Mac desktop. Type in the name of the file that you want to find. If you are not sure of the exact name, type in only a few characters of the title. When spotlight displays your results, select the file from the list. This will automatically open the folder or file in Finder where your target item is. If you wish to change a single image, you may have to back out to the folder it is stored in. Alternatively, if you know where the file is stored, simply navigate to that location.

Step Two: Getting The File Info and Making The Change

Once you have located the file, you can single click on it to highlight it. Once the image is highlighted, go to the menu bar at the top and choose “File -> Get Info”. This will bring up the information bar for this file. Here, you will see a variety of options for your image. Click on the arrow next to the worlds “Open With.”

This will expand your file associations options for this file, but it will also give you access to change the extensions for all files of this type. Here, you will see a drop down box. It will show the name and icon of the current program that you use by default. In most cases for an image, you will see the word “Preview” written there. If you want to use Photoshop, and you have it installed, all you have to do is choose that from the drop down menu.

Changing All The Files

Lets say you want to change all of the file associations. Well, all that you have to do is follow all of the same steps as above, but after you change the drop down box, click on the button that says “Change all”. This will change the association for every file of this type.

Default Application To Open Files

That’s it.