doc iconCur extension is associated with Cursor - Mouse pointer file. You can try to open cur files by using Cursor Editor.

It is a file which indicates the mouse pointers shape. For example, normally mouse pointers shape is an arrow but sometimes it takes the shape of hour glass. 

Cursor files are generally used by programmers. You have chance to use your picture as a mouse pointer with Axialis Ax-Cursors software. 

You can find free Cursors from following sites: and

What to use cur

Cursor Editor

which page related to cur file

cur Related Searches

You can check related links about cur fileextension.