Compressed archive (LH ARC)
LZH came from work on LZ77 compression with additional dynamic compression provided with Huffman coding. The LZH file format had its roots on the Amiga. LZH files are more common in Japan than elsewhere. Can also go by an LHA extension.
MIME type: application/lzh, application/x-lzh, application/x-lha, application/x-compress, application/x-compressed, application/x-lzh-archive, zz-application/zz-winassoc-lzh, application/maclha, application/octet-stream
Learn more about LZH files:
Wikipedia has an entry on LZH/LHA.
Ask an IT peer an LZH-related question at IT Knowledge Exchange.