ZIP Compression Tools
Any ZIP software utility supporting the compression method DEFLATE can be used to create a PACK file. Simply, create the ZIP file and rename it to *.PACK.
The compression tool 7-Zip supports command line calls and can be used in batch scripts like gen_pack.bat for automated Pack file creation (and verification with packChk.exe). Installers for 7-Zip are available for 32-bit and 64-bit Windows operating systems.