Beta version of the ASIM 1.0 source code and documentation [April, 2010]:
These files were previously tar'd and then gzip'd.
To extract use 'gzip -v -r -d ASIM_Compressed.gz' followed by 'tar xvf ASIM_Compressed', after the files are downloaded.
Please refer to the tutorial section in the 'ASIM Users Guide', located in the docs folder, for instructions.