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What is a .ucsf file?

A .ucsf file is a Sparky (version 2). This one is a specialist format without an obvious everyday home.

How to open a .ucsf file

  • The program that created it is by far the most reliable way to open it.
  • On Windows, use a hex viewer or the free TrID tool to identify what the file really is.
  • On Mac or Linux, running `file yourfile` in the terminal identifies most formats instantly.

The registry records this extension against Sparky, so software from that family is the most likely match.

How to convert a .ucsf file

  • Identify the file first, then look for an export or Save As option in whatever program can read it.

The technical record

For archivists, developers and the merely curious: these are the PRONOM registry entries for .ucsf.

Format nameVersionMIME typePUID
Sparky2fmt/1226

Got another one?