Your Reckon Accounts personal range (Desktop) data file set would be comprised of multiple files with the same name with different file extensions.
<Filename>.<file extension>
Example:

The files you need to send us are the one with the following file extensions
Example file names:
QDATA.QDF – this is the main component
– it may also appear with the name "My Company File" not displaying the QBW file extension
QDATA.QSD – these are supplementary files
QDATA.QEL – these are supplementary files
QDATA.QPH – these are supplementary files
QDATA.RKN – this is a compressed backup set
Backup file sets you should consider sending to us if available
– these backup file sets can be found on your computer locally, on a remote network attached storage/server computer or on an external storage device.
Example:
QDATA.RKN – this is a compressed backup set
QDATA2.QDF – this is the main component
QDATA2.QSD – these are supplementary files
QDATA2.QEL – these are supplementary files
QDATA2.QPH – these are supplementary files

You will need to send us all of the files that make up the data file set.
Locate your Reckon Accounts personal range data file set
DATA RECOVERY: How to find a data file using Windows Search