This command-line utility allows you to decompress BIQ/SAV files (one per time invoked). This is intended for those who wish to incorporate such functionality into their own Civ3 utilities. You can easily invoke it as follows:
java -jar BIQDecompressor [inFile] [outFile]
Then just wait for the process to terminate, and your decompressed file is ready.
For more details, see the thread here.
Cross-Platform SAV/BIQ Decompressor (command-line) 2016-10-05
Cross-Platform SAV/BIQ Decompressor (command-line)