I recently needed to use a few (slightly) non-standard encodings in a tclkit and wondered how I can register them at runtime. The solution that I eventually found was to copy the '''*.enc''' file into the ''encoding'' subdir of $tcl_library, like this:

 file copy shiftjis.enc [file join $tcl_library encoding]

For '''tclkit'''s the $tcl_library directory is a virtual one (in memory), so it's ok to copy files into it.  They aren't saved on disk.

Starting with Tcl 8.5, the [encoding dirs] command allows a script
to direct Tcl to find '''*.enc''' files in other directories as well.

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