You need to identify files with a .ts (transport stream) file extension when using Samba. By (crazy) default,, Windows suppresses the file extension for known file extensions. Either switch off the option or locate the .ts by using the file search wildcard *.ts. A recording on this box consists of a whole family of associated sidecar files with the same filrename other than the extension. other than the main .ts file ( .nts. .hmt and .tac files).
Basically .nts has navigation data that allows the Foxsat to navigate the file using it's forward/reverse skip keys, fast forward and reverse etc, the .hmt contains all sorts of data like the channel recorded from, recording start date, duration etc and the programme synopsis (much of this is in ascii format and can be viewed using simple binary editing software with a ascii view of the data). The .tac files are simply small image files used to create the chapter thumbnails, if you delete these on the box, they will be re-created on the next housekeeping cycle. A easy test if the file is encrypted is open the .ts in the free MediaInfo app. If it reports no PAT then the file is still encrypted.