There is a Linux Compatable SPK library available. It includes 2 command line tools for using SPK files, SPKConvert for converting to the new format SPK files, and SPKTool for maniuplating new format SPK Files.
SPKTool can be used to extract the contents of SPKTools, as well as create new ones and add files to existing files.
To use the Linux Tools, you need to goto the downloads section and download the Linux Utils.
Then you can extract and compile it.
Extract the files:
tar -xzvf SPKUtil-1.00.tar.gz
Auto Compile:
cd SPKUtil-1.00 ./compile.sh
Manual Compile:
cd SPKUtil-1.00/src make make distclean cd ..
Running:
Once the program is compiled, you can run it using ./spktool