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UDF File Format

User-Defined Function (Microsoft Excel)

UDF is a user-defined file format for Microsoft Excel. UDF stands for User-Defined Functions. UDF files are made using Visual Basic for Applications and allow the user to create custom functions which can be used repeatedly on numerous spreadsheets and work books. UDF files can be created in Excel by selecting the “Module” option in the “Insert” menu.

MIME: application/excel, application/x-excel

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This was last updated in July 2010
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While looking through an archive of old backup disks. I found one that showed 29mb of data on disk, but would not open. Further exploration showed it had a udf format on disk, from July 2009.
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Our Ricoh devices backup file is a UDF file.
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Created a AVCHD video using Serif Movieplus software. this created a UDF (noted in info file) disc which so far will not play on anything I have. I believe it might play on Blue ray drive, but not yet tried this yet.
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https://en.wikipedia.org/wiki/Universal_Disk_Format

It's ALSO a newer version of the .iso format for CD/DVD images on disk.
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