My conclusions from PKWARE Application Note:

1. Encoding must be OEM code page of terminal where zip will be viewed or 
unpacked;
2. "version made by" field must be set in accordance with OS where zip will be 
viewed or unpacked;
3. If filenames encoded in UTF-8 (Linux terminal code page), general purpose 
bit 11 for UTF-8 must be set for crossplatform compatibility. Last versions of 
some windows archivers supports it.

I have no idea yet what command line options and defaults must be and how 
integrate it with CGI.
But with hardcoded charset and "version made by" BackupPC_zipCreate works 
perfectly well with most windows archivers.

BackupPC_zipCreate:
8<--------------------------
#=> Set OEM code page for unpacking terminal
my $Charset = "cp866"; #Cyrillic code page. Change to yours windows terminal 
code page.
8<--------------------------
    # Specify the compression level for this member
    $zipmember->desiredCompressionLevel($compLevel) if ($compLevel =~ /[0-9]/);

    #=> Set "version made by" field to 0 (MS-DOS)
    $zipmember->fileAttributeFormat('FA_MSDOS');

    #=> Set general purpose bit 11 for UTF-8
    $zipmember->{bitFlag} = $zipmember->{bitFlag} | 0x0800 if ( $Charset eq "" 
);

    # Finally Zip the member
    $zipfh->addMember($zipmember);
}
8<--------------------------

P.S. Also Appendix D of Application Note on the .ZIP file defines optional 
"Extra Field" storage for UTF filenames. But no archivers that really supports 
it.

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