'c' - CONCATENATE ARCHIVE(S)

[REGISTERED VERSION ONLY]

The concatenate command either appends one or more archives to an existing
archive, or creates a new archive by appending one or more archives together.

For example: lzx c dest.lzx arc1.lzx arc2.lzx

If "dest.lzx" exists, the archives "arc1.lzx" and "arc2.lzx" will be appended
to it.  "arc1.lzx" and "arc2.lzx" will be unchanged.

If "dest.lzx" does not exist, it will be created, and will consist of
"arc2.lzx" appended onto "arc1.lzx".  "arc1.lzx" and "arc2.lzx" will be
unchanged.

This command is provided to append compressed data from one archive to
another without having to recompress the archive.

NOTE: LZX performs no checking for duplicate files; it simply concatenates
      the archives together blindly.