I am sorry for the long explanation, but I think it covers and explains everything you need to know.
Right, I have the solution. I have needed to do this I think every time I create an iso image.
What you need is a FREEWARE program called Locate32. It has its own website, so it is easy enough to find.
When it has been installed, you will need to "Update Database". What this does is locates everything in the computer.
This is done by 'File-Update Databases'.
A % reading will show on-screen.
When it is done updating (YOU MUST ALLOW THIS TO FINISH OR THE PROGRAM WILL CRASH), type the title of the iso you are looking for in the "Named" box, but without the extension (eg if it is titled "myholiday.iso", type "myholiday" (without quotes)).
In the "Extenstions" box, put "iso" (no quotes, no dot).
Now comes the tricky bit.
The box down the bottom that shows located files will likely show TWO files of the same name, but in different locations. One will be where you wanted it to go (I will assume this is C: but you can apply this to your own situation), the other will look similar to this "C:\Users\USERNAME\AppData\Local\VirtualStore". USERNAME is the name of your logon, so it would be replaced with the word "Mark" if you log on as Mark.
The file in the C: location is not actually there. It will open, but if you try cut/paste it, it will not work. The file in the other location is it's place. you can "right-click, open containing folder", and it will be highlighted in said folder.
Move it to the desktop.
It should become visible on the desktop now, and you are free to use it however you intended to.
Once it has been moved to the desktop, I recommend updating the database again, because it does not do this automatically. If you were to search the same file again, it would show you exactly what it did the first time, because it assumes it is still there.
STUFF YOU WANT TO KNOW
You may be concerned that because it is listed in two locations, it may be consuming twice as much space. It is not, the listing in C: is some sort of invisible shortcut to the actual file. Once you move the file to the desktop, the shortcut in C: will disappear.
This program does tend to crash often, but I have yet to find another program that is as easy or functional as this.
During installation, a shortcut may be placed on the desktop called "Updtdb32". This updates the database inside the cmd box. It is just a non-gui way of updating the database.