The CUR extension is a nearly identical image of the extension that is used for the non-animated cursors in the Microsoft Windows Operating System. The .ICO format, on the other hand, is basically an image based format for the computer icons in the Windows Operating system.
The one difference these file formats posses is that the bytes that are used to categorize them along with the addition of the hotspot in the CUR file format header. The hotspot defines the pixel offsets from the top-left corner that is of the cursor image where the user is just pointing the mouse.
In addition to the problem described above, i.e. the lack of the appropriate application to support the .CUR file, there may be several reasons that cause problems with opening and operation of the data format:
A quite common problem is the lack of application in the appropriate version. Even if you have an application, with the help of which you should open the .CUR file, you may have a problem with it because of its version. Perhaps in previous versions the application has not yet supported the .CUR file, so download the update and check again.
If you have already installed the appropriate application, and it is the correct version, the file may not open correctly, because the operating system does not have information that this program supports the file. So you need to "show" which program the computer should use. To do this:
It also happens that the file you want to open is corrupt and therefore there is no such possibility. In this situation, you should find its different version, or ask a person from whom you got, to send it again.
There may be several reasons why you cannot open the file with .CUR extension. Directly on this website you can find a solution of the most common problem with the .CUR file – that you do not have on your computer the appropriate program to open the file.