Sorry my coworker got hit by this too, he worked around it by using libreoffice to convert the .xls file to .xlsx.
I'd updated the xlrd package to 2.0.1 and pushed it to experimental to see how much it might break, Looks like there was some more discussion while I was fiddling with the package. On the plus side the update also enabled autopkgtests for xlrd. Though I had to switch from pulling from pypi to github to keep being able to build the -docs package, as upstream removed it from their pypi release. Diane
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