Such discs must be written in the so-called "Mode 1", which is compatible with both the ISO 9660 and UDF 1.02 filesystems, and therefore limits the amount of data that can be stored on an 80-minute CD to 700 MiB.
Many DVD players do not support any UDF revision other than version 1.02.
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Systems which do not support UDF (such as Windows 98) will only present a HTML page (stored on the disk, outside the UDF part), explaining the problem and linking to a free UDF reader software.