cur .cur is the Windows Cursor (.cur) files. It is a static windows cursor file that is a still image that is identical to .ico (Icon) files in most ways aside from the file extensions that exists. It is used like the .ico files which are to view images in a different way. ANI formatted files, even in Windows 7 can view this type of file. It contains file header, info headers, and cursor data.
ico The .ICO filename extension refers to the ICON image file format originally developed by Microsoft. The extension is used to represent computer icon images of varying sizes designed for the operating system Microsoft Windows. Its use today has extended to developing icons for programs designed using the Microsoft developer's suite Visual Studio and other applications. Similar to other device independent bitmap file formats, the ICON file format is also in the raster graphics class of image formats where each individual pixel is part of an orthogonal dot matrix data structure with support for a limited palette of color information. As a resource file, the .ico file format has its strength in contextual use. This allows for multiple icon images of different color depth or size to be stored within the resource file and used when appropriate.