StuffIt Archive Index File
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What is a SIDX file?
Index file created by StuffIt Deluxe, a file compression and decompression utility; contains a list of reference information about files in a separate file archive; enables users to browse the contents of a particular archive without having to process or decompress it first.
NOTE: SIDX files do not store the files they reference. They only store information about the file contents in a separate archive.