Coming from cs6....to cc 17 , i had a ico file from the net that i was able to drag into the plugin folder in cs6 and i could save as ico...
Tried this for CC 17 64bit with the 64 bit ico file ICOFormat64 drag into the path folder C:\Program Files\Adobe\Adobe Photoshop CC 2017\Plug-ins
And once i open PS and try to save as, i do NOT see the ico option.
Is this supported in cc17? Is the file path wrong for the file?
You could add your support to an existing Feature Request:
And have you done a Forum search?
Here is the answer...you have to CREATE THE FOLDER on the 64bit CC 2017 then it works.
^^ THIS ^^ Totally worked for me also!
Make sure you put the file in: Adobe Photoshop CC 2014 > Plug-ins > File Formats (be sure to create that folder)
Then make sure in Photoshop:
Image > Mode > RGB