Files that contain the .upd file extension are normally associated with software update files. The UPD files that are used for updated contain the text information about the contents of an associated program update.
These UPD files are similar to the README files that are included with many program downloads, but UPD files are included with the updates and not with the download of the actual application itself.
A variety of software applications use the .upd file extension for their software update information files. dBase, Ulead and McAfee are just a few of the applications that use the UPD file format for program updates.
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If you have additional information about the UPD file format or software that uses files with the UPD suffix, please do get in touch - we would love hearing from you.