I try to use expl3 in plain TeX with the code:

\input expl3-generic %
Some text

I have en error message with all engines. For example, with pdftex:

! I can't find file `l3backendpdfmode.def'

I suspect an hyphen to be lacking in expl3-generic.tex (date 2019-07-01), line 89.

  • There is a hyphen missing in the file. It should look for l3backend-pdfmode.def. Commented Jul 25, 2019 at 14:17

1 Answer 1


Yes, there is a missing - here. We have a fix in-hand in the development version: this is likely reasonably urgent, and I will arrange a CTAN release later today.

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