Package bug-fix release needed.
The reason of `mime-viewer/extract-content' failures is incorrect
permissions of files in packages `lib-src' directory, in particular,
`tm-file'. Those files in package tarballs were executable up to
package version 1.34 and ceased being executable in 1.35. Changing
their permissions manually fixes things.
Currently their permissions are copied from those in package source
tree, and may be easily lost when copying source trees. Specifying
file permissions explicitly in package source file data would be
safer, but I do not know the way to do so. If I knew, I would just
submit a patch :-/.