How to burn ISO images natively in Windows 7 when ISO files lost its original association?

Solution 1:

You can also install the application called ISO Recorder. V3.1 now supports Windows 7 and 64 bit.

Solution 2:

Click Open, when the dialog box pops up stating that it can't find an appropriate program, Click Select a program from a list.

Windows Disc Image Burner will be in the list. Ensure the Always open this file type with this program box is checked and click OK.

Solution 3:

It's called isoburn.exe and is located in your System32 folder. So if it loses the association, you can Open With... and "Browse", go to C:\Windows\System32\isoburn.exe and make it open it with that from now on.