I have some programs that create specific types of files that do not yet have an icon design for them, I am wanting to do this for convenience and simplicity since i don't want to have to look at every extension for each file type that doesn't have an icon assigned to it. How do i assign an icon design for a specific file type.

for instance my wireshark program saves files as .cap and i want the wirehshark icon to be the icon for this type of file (but without color to make it distinguished) I want a way to make the computer assign an image to each file at the same time instead of having to do each one manually.

If i need to clarify a little let me know

Some programs don't add the icon to the menu you have to do it manually.
It's usually in the folder that you extracted. So you just have to know what directory the program was installed to.

No i am talking about the files that the program saves. For instance wireshark saves it's capture files as .cap and i want to assign an icon to those types of files, I want to make it to where whenever i i save a file it will automatically have that icon for it so i can distinguish it easier than looking at the extensions for all of the files

I'd start looking under /usr/share/icons/... I know that is where Gnome-based workstations have icon files.

I don't know how the match between datafile-on-disk and icon-file-to-show takes place.
Please return and fill in the details so the rest of us can learn, too.

Hope this helps,
~~~ 0;-Dan