I'd like to modify a few elements of Complex, such as research costs/speed, unit caps, experiment with disabling particular ships/weapons, etc.

I've been reading through the modding process on the GBX forums and have tried extracting the ComplexEVOdevbuild40.big file using archive.exe and the appropriate powershell/command line commands, but I get the following error (%PathToUserFolder% subbed in for my local user's folder for privacy/brevity):

Command:
.\Archive.exe -a ..\..\HomeworldRM\DataWorkshopMODs\76561197971047212\398406822\ComplexEVOdevbuild40.big -e '%PathToUserFolder%\Desktop\HW2Edit\'
Extracting Archive Contents

Extraction TOCEntry
Name : 'toccomplexevodevbuild40'
Alias: 'data'

Error during extraction, could not open file '%PathToUserFolder%\Desktop\HW2Edit"\ai\default\classdef.lua' on disk for writing.
-- FATAL EXIT --
178 main.c :
--stack trace--


0x77AD6359: BaseThreadInitThunk (C:\WINDOWS\System32\KERNEL32.DLL)
0x77C77A94: RtlGetAppContainerNamedObjectPath (C:\WINDOWS\SYSTEM32\ntdll.dll)
0x77C77A64: RtlGetAppContainerNamedObjectPath (C:\WINDOWS\SYSTEM32\ntdll.dll)

I've tried running the command prompt/powershell session as administrator and it behaves the same way. I've also tried XUnpack to see if I was missing a decryption step and the UI for XUnpack sees all of the .big files in the HW directory structure but does not list the Complex one in the list.