Aura HD with current 4.7.10413 firmware. When I go to "My Books" this morning (sort order is set to Recent), there two entries on the first page, both with the title "Id" and author "Unknown Author", and both plain txt files 37 bytes in size. When I have a look at either of them, they both just contain a single GUID/UUID (see
http://guid.one/guid for an explanation). I have no idea where these came from - I only ever sideload books using Calibre, and I don't use the Kobo desktop application at all.
When I view details for either of them, it shows:
Publisher: (1/13/18)
Language: English
File Size: 37 B
File Format: txt
When I attach the Kobo to my PC and mount the internal memory and SD card as drives, I can see that these two "books" correspond to two files named Id.txt in the root folder of both drives - the contents of each file are the same GUID as I see if I open the file as a book on the Kobo.
Any idea how these appeared and whether I can safely delete them?