Just to make some things clear:
"dz" is the file ending for the "dictzip" file format, which is basically a slight extension of the gzip compression format. As Lomedin already mentioned above, dictzip files can be simply extracted using any decompressor supporting gzip. And indeed, ColorDict does not support dictzip compressed files but you need to decompress them before usage.
I have never seen the combination of a "dz" and an "index" file without an "ifo" file before. But it might just conform with the StarDict format (renaming idx to index), because eventually you could get along without the ifo file just fine, if you assume some trivial settings. If you point me to a dictionary with "index" and "dz", I can check this guess.
To answer the question in the first post: A tool that supports a lot of formats is "GoldenDict". A tool, that can handle and convert a whole bunch of dictionary formats is PyGlossary.
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