Right Click the image file -> Open With -> Choose Default Program -> Click on 'Browse' -> and then open this Location - C:\Program Files\ADOBE\Adobe Lightroom
Click on Lightroom.exe and your file will open in Lightroom.
So next time you will open the same image format, You will see Lightroom option in context Menu.
If you want to change this setting for more than one file format, you might want to change that in from control Panel. Here's the path - ( Control Panel\All Control Panel Items\Default Programs\Set Associations )
Lightroom cannot be a program that is used to open photos from another application. Lightroom does not "Open" photos. It must Import photos, and that must be done from Lightroom, not from any other program.
In Windows 10 / LR 6, associating a file format with LR (as outlined above) will cause it, together with the rest of the folder in which it is located, to open in the LR Import dialog - which if you think about it is actually a sort of browser.
Dj_paige is correct in the post above.
We all must think of Lightroom as a "Database" program that opens databases (otherwise known as 'Catalogs' xxxx.LRCAT )
MS-Word opens .doc .docx files
MS-Excel opens .xls files
MS-Access open .mdb files
Lightroom opens .lrcat files (catalog files)
Photoshop ( & Elements) opens picture (pixel) files .jpg .tiff etc.
However it is a good feature of Lightroom that you can- Open Lightroom program, click the 'Import' button, and then mouse-drag a whole folder of images onto the import window, to 'Import' the images into the LR database (Catalog).
Once you have referenced you images in the LR database then they become visible as previews in the library grid, and available to 'open' in the develop module of LR. - But it's definitely not a 'browser'!
I did not say that LR is a browser. I said that the IMPORT page functions like a browser. It reads and displays jpgs, tiffs, and the embedded jpgs in Raw files and acts as a portal sending metadata about them, when so instructed, to the active catalog. That is what a browser does. And it is a fact that in recent versions of Windows in the right-click context menu for those file formats, LR can be brought up in the "Open with..." menu and this command will launch LR and open the Import dialog.
"Open with..."...will launch LR
Yep, learn something new every day! Maybe new in the latest LR-CC. I could never achieve it in the past.
I have just installed Windows-10 and the option to "Open with... Lightroom" was not immediately available.
Lightroom did not even show in the list of "Apps" that Windows thinks will do the job.
But if you right-click to 'Open-with'- and select "More Apps" then scroll to the bottom of this list you can click on "Look for another app on this pc." Then search for Lightroom.exe which is most likely in C:\Program Files\Adobe\Adobe Lightroom.
Now you have it!