Undo file associate defualt program

[Impr3ssiv3]

I was trying to open a .ddj file to edit it and i did the open with and chose Photoshop hoping it would work but it didn't and i mistakenly chose to "use this program for all these files" and now all the .ddj files show up with a PS icon. How do i undo this and set the icon back to the unknown file type icon and have it so that i get the prompt that windows doesn't know what program to use

 

[Impr3ssiv3]

nvm i found the solution


i was looking in the registry but unknowingly it was as simple as lookin in folder options