Yes, it works now (I tried a bunch of files including the last
problematic ones). I get the following and a series of .tif output which
darktable understands.

$ align_image_stack -m -a OUT DSCF3716.exr DSCF3717.exr DSCF3718.exr
Exiv2: Error reading metadata (DSCF3716.exr: The file contains data of an 
unknown image type)
Exiv2: Error reading metadata (DSCF3717.exr: The file contains data of an 
unknown image type)
Exiv2: Error reading metadata (DSCF3718.exr: The file contains data of an 
unknown image type)
Written aligned images to files with prefix "OUT"

Thank you!

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https://bugs.launchpad.net/bugs/1750398

Title:
  align_image_stack fails to open EXR files

Status in Hugin:
  Fix Committed

Bug description:
  align_image_stack fails to open EXR files generated with darktable,
  the output is as follow:

  $ align_image_stack DSCF4117.exr DSCF4118.exr -p OUT.exr
  /build/hugin/src/hugin-2018.0.0/src/hugin_base/panodata/SrcPanoImage.cpp 346 
Error opening file
  /build/hugin/src/hugin-2018.0.0/src/hugin_base/panodata/SrcPanoImage.cpp 346 
Error opening file
  Written project file OUT.exr

  (an output file is generated, but it is only 12.9KB)

  I have tried every compression method (off, RLE, ZIP, ZIPS, PIZ,
  PXR24, B44, B44A) and the result is consistent. I'm using Arch Linux
  with hugin 2018 and openexr 2.2.0.

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