pdftk can't handle emdashes in filenames

Question

I'm trying to use pdftk (v 1.40) to combine some pdfs (using it's cat command). As a simple test, I can do

pdftk "/home/deploy/Foo - Bar.pdf" cat output results.pdf

and that works fine (I'm only combining one file here, but it's still a valid test). But, if the filename has an emdash it balks:

$ pdftk "/home/deploy/Foo — Bar.pdf" cat output results.pdf
Error: Failed to open PDF file: 
   /home/deploy/Foo — Bar.pdf
Errors encountered.  No output created.
Done.  Input errors, so no output created.

The file exists:

$ ls -l ~/Foo*
-rwxr-xr-x 1 deploy deploy 15180 2017-11-01 11:15 /home/deploy/Foo - Bar.pdf
-rwxr-xr-x 1 deploy deploy 15180 2017-11-01 11:14 /home/deploy/Foo — Bar.pdf

I googled this a bit and saw someone complaining that it can't handle umlauted characters, so I thought it might be something to do with extended character sets, or character encoding generally.

Answer 1

In case anyone else encounters this, the solution was simply to upgrade pdftk. I had version 1.40, the fix was in v1.41!