photoviewer.dll.VPCZ21AJ.reg is exported from Windows 10 Pro on SONY VAIO Z VPCZ21AJ that upgraded from Windows 7 Professional.
photoviewer.dll.win10pro.reg is exported from clean installed Windows 10 Pro.
Result of diff command is below:
$ diff -ca photoviewer.dll.win10pro.reg photoviewer.dll.VPCZ21AJ.reg
*** photoviewer.dll.win10pro.reg 2018-08-09 20:33:12.735871000 +0900
--- photoviewer.dll.VPCZ21AJ.reg 2018-08-09 20:46:28.928032500 +0900
***************
*** 4,9 ****
--- 4,27 ----
[HKEY_CLASSES_ROOT\Applications\photoviewer.dll\shell]
+ [HKEY_CLASSES_ROOT\Applications\photoviewer.dll\shell\open]
+ "MuiVerb"="@photoviewer.dll,-3043"
+
+ [HKEY_CLASSES_ROOT\Applications\photoviewer.dll\shell\open\command]
+ @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
+ 00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\
+ 6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\
+ 00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,00,73,00,\
+ 25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,68,00,6f,\
+ 00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,00,68,00,\
+ 6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,6c,00,6c,\
+ 00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,\
+ 5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,20,00,25,\
+ 00,31,00,00,00
+
+ [HKEY_CLASSES_ROOT\Applications\photoviewer.dll\shell\open\DropTarget]
+ "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}"
+
[HKEY_CLASSES_ROOT\Applications\photoviewer.dll\shell\print]
"NeverDefault"=""