Bad output on patch archive extraction

[heinermann]

When extracting storm.dll from a patch archive using mpqcli, it appears to be corrupted with extra bytes before the header. MPQEditor extracts the file without the extra bytes.

In a powershell,

curl -L -o patch.exe http://ftp.blizzard.com/pub/broodwar/patches/PC/BW-1161.exe
curl -L -o mpqcli.exe "https://github.com/TheGrayDot/mpqcli/releases/download/v0.9.6/mpqcli-windows-amd64.exe"
.\mpqcli.exe extract -f storm.dll -o . patch.exe

Source	Filesize
mpqcli	409,624 bytes
MPQEditor	409,600 bytes

Extra bytes before the magic MZ (PE header).
18 00 04 01 00 00 00 00 00 00 00 00 00 40 06 00 F2 7C 83 AE AD 72 C9 01

Do you know if this is actually part of the file that MPQEditor strips out magically or if it's a bug in mpqcli? The 4th dword seems to be the filesize.

[heinermann]

For now I'm using a workaround to trim those extra bytes until MZ which works for me so this is not pressing.