wftpserver for Windows not implement SITE UNZIP

[ksldenity]

Latest Wing FTP Server v7.3.4 for Windows
FEAT command returns
SITE HELP
SITE PSWD oldpass newpass
SITE UZIP filename.zip
SITE ZIP filename.zip sourcefile1||sourcefile2||sourcefile3||...

and I can successfully send "SITE ZIP xx.zip xx.txt" to generate xx.zip
But "SITE UZIP xx.zip" returns "501 Command not implemented."

In Users settings I have toggled all the permissions including "Zip files" and "Unzip files"

[ksldenity]

But "SITE UZIP xx.zip" returns "501 Command not implemented."

This is a typo and I mean "SITE UNZIP xx.zip"

[ksldenity]

OH I tried UZIP and it works
My bad
thanks for these wonderful software including ftprush and wing ftp server