Provide BUP file support for more issues.
The BUP file is only opened when the IFO file open fails. We have a few times where file corruption could happen and we could use the BUP instead. This patch attempts to address this by trying to open the BUP if there is any reported error w/ the IFO. Inspiration for this patch came from Rich E, thanks for the detailed bug report and attempts at using earlier patches.
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