To extract files from a .msi file at the command line, type:
msiexec /a PathToMSIFile /qb TARGETDIR=DirectoryToExtractTo
For example, to extract files from f:\zenworks\zfdagent.msi into c:\zfd701 you would type:
msiexec /a f:\zenworks\zfdagent.msi /qb TARGETDIR=c:\zfd701
The destination directory does not need to exist prior to running this command.