ICQ 2001 saved ICQ contact information
File type: Settings, options, themes or skins file
The .uin file is a legacy ICQ 2001 file that stores saved ICQ contact information.
It belongs to the older ICQ instant messenger and is not a general-purpose document format.
File type category:
Settings, options, themes or skins file
Date updated: September 30, 2026
ICQ 2001 used the UIN file extension for its default contact information format. The file held saved contacts used by the ICQ client.
The format was associated with ICQ software for Microsoft Windows, Apple macOS or Mac OS X, and Linux or Unix. It is a legacy format and is unlikely to be used by current versions of ICQ.
Open the file with the older ICQ 2001 client that created it, on its original supported platform where possible. A current ICQ installation may not recognize this legacy format.
Because the file contains ICQ contact data rather than ordinary text, opening it in a text editor will not display the contacts correctly.
If an older ICQ client can read the file, use that client to recover the contacts.
Otherwise, the contacts may need to be recreated manually in a compatible ICQ client.
Software apps that import uin files:
Software apps that manage or store settings in uin files:
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