[OUTATIME]

Originally Posted by soilwork

For previewing sony format (LRF) files on PC, you can use either
(1) Sony ebook library software (free download), or
http://ebookstore.sony.com/downloadclient.html
(2) open source LRF viewer included with libprs500.

About converting PDF into LRF, you can try 'PDFLRF' in addition to libprs500. If the pdf documents contain maths or figures, PDFLRF may work better since it process the file as images.
https://www.mobileread.com/forums/showthread.php?t=13135

That's excellent, thank you very much for those links.