https://bz.apache.org/bugzilla/show_bug.cgi?id=58061

--- Comment #14 from Nick Burch <[email protected]> ---
No response on my libgsf or OpenMcdf bug reports

I had a play with the Node.JS OLE2 library js-cfb
<https://github.com/SheetJS/js-cfb> - this is able to read the NPOIFS
ministream without error, just like OpenMcdf can do. I've also tried the Perl
module Spreadsheet::Read, and it reads the NPOIFS file fine too

Microsoft released a new version of the [MS-CFB] file format spec last week,
but sadly that didn't seem to have any changes in it that cover this case

At this point, it looks like a subtle issue where one reading of the format
spec differs slightly from the one Excel + OO has. Unless someone else can spot
something, it's probably going to need setting up a Windows C development
environment, writing a simple lister with the same OLE2 functions that Excel
uses, and stepping into that with a debugger to see why it doesn't like our
ministream.... Any takers? :)

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