Hi, Jan.
A "Q fileset" is what Quicken calls "a file". Everybody else agrees on the definition of "file", but Intuit's definition of a Quicken "file" includes several related files. The set always includes one with the .qdf extension, but it usually also includes from one to a half-dozen or so with the same filename but with other extensions, such as .qel, .qtx, .qph, .idx, etc.; the composition of the set varies depending on which Quicken features are used by each customer. While Quicken calls the whole group "a file", we often refer to them as a "fileset" to emphasize that Quicken needs the whole group to run properly.
Fileset sizes grow with use; mine currently includes 6 files totaling nearly
40 MB, including 30 MB in my .qdf file. In addition, Quicken creates a full set of backups each week and saves the 5 latest weeks in the \BACKUP subfolder, which it created in my Quicken folder.
Whenever we use Quicken's own tools (Copy, Backup, etc., usually on Quicken's File menu), the whole set is handled automatically as needed. But when we are dealing with Quicken files outside Quicken (such as in Windows' or a third-party's Copy or Backup program), we must remember to include the full fileset. Many users have used Windows Backup to save their .qdf file to a different folder or computer and then have been disappointed to find they also needed those other files in the set - which may no longer be available. :>(
So if you are moving your JanG.qdf file, using tools other than Quicken's, be sure to move the whole JanG.* fileset, including JanG.qel, JanG.qtx, etc., to avoid disappointment later.
RC