SD2IEC REL support

From: silverdr_at_wfmh.org.pl Date: Fri, 31 Jan 2020 09:06:25 +0100 Message-Id: <51BEEF7E-DFF3-437F-9A33-6E9A78774CDE_at_wfmh.org.pl>

sd2iec.de says:

REL files:
 ==========
 Partial REL file support is implemented. It should work fine for existing
 files, but creating new files and/or adding records to existing files
 may fail. REL files in disk images are not supported yet, only as files
 on a FAT medium. When x00 support is disabled the first byte of a REL
 file is assumed to be the record length.

The questions:

- how can I have an existing file when creating it "may fail" (and actually fails)?
- what is "x00 support"?

-- 
SD! 