This file associated issue is result of the Windows 10 KB3135173 update, which takes over the file association back to Photos from other applications.  It affects ACDSee and other image and video applications.  You can visit this link for more information: 

https://social.technet.microsoft.com/Forums/en-US/2dc8c9e0-324d-422d-ba0d-fac5d5c4aee0/an-app-default-was-reset

To address this issue, a solution is proposed at winhelponline.com to reset the file resolution registry in Windows 10 :

http://www.winhelponline.com/blog/windows-10-resetting-file-associations/. 
Using Registry Editor incorrectly can cause serious issues. So before you edit the registry, please make a backup. 

1.    Open the Registry editor. 
2.    On the 'Registry' drop-down menu, click 'Export Registry File'. 
3.    In the Export range panel, click 'All', then save your registry as Backup.