Microsoft Windows Animated cursor
ANI files contain several images sequentially ordered to provide an on-screen animation to indicate progress. ANI files are included as part of the Windows installation, or can be installed from third party sources. ANI files can be created and opened by several pieces of third party software, including AniTuner and AniCursor.
MIME type: application/octet-stream
Learn more about .ANI files:
Learn about Animated Cursors at the Microsoft web page.
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