Feature request: allow users to add custom files

[frabnet]

Hi and thanks for this software. I was wondering if it's possible to add custom files to the ISO.
I think the script is already capable of adding files, like with the $OEM$ folder.
In this case, I'd like my files to be placed in the root of the iso file, not sources\$OEM$\
For example, maybe some one needs to add a custom autounattend.xml in the root of the ISO.

EDIT: It would be good if this task would be "unlinked" from the 'DEF' stage. In other words: adding custom folder without adding: $OEM$ PID.txt EI.cfg auto.cmd unattend.xml.

[AveYo]

If it would be "unlinked" from the 'DEF' as you say - it would not make a default mct media then and that's the primary expectation of the option. Feel free to adjust it for your own personal use, but I can't accommodate your request.

$OEM$ folder is quite versatile, can direct setup to copy the files anywhere in the system.
I'm not a fan of autounattend.xml in the root of the ISO, it kinda breaks upgrade setup.
That's why for windows 11 the script places such configuration to enable home local account in boot.wim - you could use that as a template.

Other files are beyond the scope of this script and what you expect to find in a windows iso.
It would add too much randomness with unforeseen issues if I were to support picking up any files next to the script automatically - what if it clashes with the setup files and breaks it somehow?
You can however add any files afterwards with Power ISO for example, or do it manually after you mount the ISO and copy all files somewhere ex. C:\ISO\Dir, make your modifications, then recreate the ISO with a simple dir2iso.bat script:

@echo off & title DIR2ISO
set ISODir="C:\ISO\Dir"
set Label=Windows
set Output="C:\ISO\%Label%.iso"
if not exist %ISODir% echo place the target ISO files in directory: %ISODir%
call :DIR2ISO %ISODir% %Output% %Label%  
pause
exit /b

#:DIR2ISO:#  [PARAMS]: "directory" "file.iso" [optional]"label"
set ^ #=$f0=[io.file]::ReadAllText($env:0); $0=($f0-split '#[:]DIR2ISO[:]' ,3)[1]; $1=$env:1-replace'([`@$])','`$1'; iex($0+$1)
set ^ #=& set "0=%~f0"& set 1=;DIR2ISO %*& powershell -nop -c "%#%"& exit /b %errorcode%
function DIR2ISO ($dir,$iso,$label='DVD_ROM') {if (!(test-path -Path $dir -pathtype Container)) {"[ERR] $dir"; return 1}; $code=@"
 using System; using System.IO; using System.Runtime.Interop`Services; using System.Runtime.Interop`Services.ComTypes;
 public class dir2iso {public int AveYo=2021; [Dll`Import("shlwapi",CharSet=CharSet.Unicode,PreserveSig=false)]
 internal static extern void SHCreateStreamOnFileEx(string f,uint m,uint d,bool b,IStream r,out IStream s);
 public static int Create(string file, ref object obj, int bs, int tb) { IStream dir=(IStream)obj, iso;
 try {SHCreateStreamOnFileEx(file,0x1001,0x80,true,null,out iso);} catch(Exception e) {Console.WriteLine(e.Message); return 1;}
 int d=tb>1024 ? 1024 : 1, pad=tb%d, block=bs*d, total=(tb-pad)/d, c=total>100 ? total/100 : total, i=1, MB=(bs/1024)*tb/1024;
 Console.Write("\r\n{0,2}%  {1}MB {2}  DIR2ISO",0,MB,file); if (pad > 0) dir.CopyTo(iso, pad * block, Int`Ptr.Zero, Int`Ptr.Zero);
 while (total-- > 0) {dir.CopyTo(iso, block, Int`Ptr.Zero, Int`Ptr.Zero); if (total % c == 0) {Console.Write("\r{0,2}%",i++);}}
 iso.Commit(0); Console.WriteLine("\r{0,2}%  {1}MB {2}  DIR2ISO",100,MB,file); return 0;} }
"@; & { $cs = new-object CodeDom.Compiler.CompilerParameters; $cs.GenerateInMemory = 1 #:: ` used to silence ps eventlog
 $compile = (new-object Microsoft.CSharp.CSharpCodeProvider).CompileAssemblyFromSource($cs, $code)
 $BOOT = @(); $bootable = 0; $mbr_efi = @(0,0xEF); $images = @('boot\etfsboot.com','efi\microsoft\boot\efisys.bin') #:: _noprompt
 if (test-path $(join-path $dir -child 'efi\boot\bootaa64.efi')) {$images[0] = 'arm64-detected-use-only-efi-mode'}
 0,1|% { $bootimage = join-path $dir -child $images[$_]; if (test-path -Path $bootimage -pathtype Leaf) {
 $bin = new-object -ComObject ADODB.Stream; $bin.Open(); $bin.Type = 1; $bin.LoadFromFile($bootimage)
 $opt = new-object -ComObject IMAPI2FS.BootOptions;$opt.AssignBootImage($bin.psobject.BaseObject); $opt.PlatformId = $mbr_efi[$_] 
 $opt.Emulation = 0; $bootable = 1; $opt.Manufacturer = 'Microsoft'; $BOOT += $opt.psobject.BaseObject } }
 $fsi = new-object -ComObject IMAPI2FS.MsftFileSystemImage; $fsi.FileSystemsToCreate = 4; $fsi.FreeMediaBlocks = 0
 if ($bootable) {$fsi.BootImageOptionsArray = $BOOT}; $TREE = $fsi.Root; $TREE.AddTree($dir,$false); $fsi.VolumeName = $label
 $obj = $fsi.CreateResultImage(); $ret = [dir2iso]::Create($iso,[ref]$obj.ImageStream,$obj.BlockSize,$obj.TotalBlocks) }
 [GC]::Collect(); return $ret
} #:DIR2ISO:#  export directory as (bootable) udf iso - lean and mean snippet by AveYo, 2021