Have someone already tried this:

tree /f /a |clip

Open notepad, ctrl + V, save in notepad as output.txt with unicode support?

Use PowerShell:

powershell -command "tree /f > tree.txt"

Test case:

create.ps1:

mkdir "Erika szobája"$null | Set-Content "Erika szobája/cover.jpg"$null | Set-Content "Erika szobája/Erika szobája.m3u"$null | Set-Content "Erika szobája/Kátai Tamás - 01 Télvíz.ogg"$null | Set-Content "Erika szobája/Kátai Tamás - 02 Zölderdõ.ogg"$null | Set-Content "Erika szobája/Kátai Tamás - 03 Renoir kertje.ogg"$null | Set-Content "Erika szobája/Kátai Tamás - 04 Esõben szaladtál.ogg"$null | Set-Content "Erika szobája/Kátai Tamás - 05 Ázik az út.ogg"$null | Set-Content "Erika szobája/Kátai Tamás - 06 Sûrû völgyek takaród.ogg"$null | Set-Content "Erika szobája/Kátai Tamás - 07 Õszhozó.ogg"$null | Set-Content "Erika szobája/Kátai Tamás - 08 Mécsvilág.ogg"$null | Set-Content "Erika szobája/Kátai Tamás - 09 Zúzmara.ogg"

Output:

tree.txt:

Folder PATH listingVolume serial number is 00000000 0000:0000C:.│   create.ps1│   tree.txt│   └───Erika szobája        cover.jpg        Erika szobája.m3u        Kátai Tamás - 01 Télvíz.ogg        Kátai Tamás - 02 Zölderdo.ogg        Kátai Tamás - 03 Renoir kertje.ogg        Kátai Tamás - 04 Esoben szaladtál.ogg        Kátai Tamás - 05 Azik az út.ogg        Kátai Tamás - 06 Sûrû völgyek takaród.ogg        Kátai Tamás - 07 Oszhozó.ogg        Kátai Tamás - 08 Mécsvilág.ogg        Kátai Tamás - 09 Zúzmara.ogg

EDIT:

Enhanced and improved version for power users

Test case:

$null | Set-Content "欲速则不达.txt"$null | Set-Content "爱不是占有,是欣赏.txt"$null | Set-Content "您先请是礼貌.txt"$null | Set-Content "萝卜青菜，各有所爱.txt"$null | Set-Content "广交友，无深交.txt"$null | Set-Content "一见钟情.txt"$null | Set-Content "山雨欲来风满楼.txt"$null | Set-Content "悪妻は百年の不作。.txt"$null | Set-Content "残り物には福がある。.txt"$null | Set-Content "虎穴に入らずんば虎子を得ず。.txt"$null | Set-Content "夏炉冬扇.txt"$null | Set-Content "花鳥風月.txt"$null | Set-Content "起死回生.txt"$null | Set-Content "自業自得.txt"$null | Set-Content "아는 길도 물어가라.txt"$null | Set-Content "빈 수레가 요란하다.txt"$null | Set-Content "방귀뀐 놈이 성낸다.txt"$null | Set-Content "뜻이 있는 곳에 길이 있다.txt"$null | Set-Content "콩 심은데 콩나고, 팥 심은데 팥난다.txt"

From his answer, @Chris Jester-Young wrote:

Now, in ulib, the WriteString method is implemented in two classes, SCREEN and STREAM. The SCREEN version uses WriteConsoleW directly, so all the Unicode characters get correctly displayed. The STREAM version converts the Unicode text to one of three different encodings (_UseConsoleConversions ⇒ console codepage (GetConsoleCP), _UseAnsiConversions ⇒ default ANSI codepage, otherwise ⇒ default OEM codepage), and then writes this out.

This means that we cannot rely on getting the characters from a stream. File redirections won't work. We have to rely on writing to the console to get the Unicode characters.

The workaround, or hack, is to write the tree to the console and then dump the buffer to a file.

I have written the scripts to add the tree context menu when you right click on directories in Explorer. Save the files in the same directory and then run Install list menu.bat as administrator to install.

Install list menu.bat

@echo onregedit /s "List files.reg"copy "List.ps1" "%SystemRoot%"pause

List files.reg

Windows Registry Editor Version 5.00; Directory.[HKEY_LOCAL_MACHINE\Software\Classes\Directory\Shell\List]"MUIVerb"="List""ExtendedSubCommandsKey"="Directory\\ContextMenus\\List"[HKEY_LOCAL_MACHINE\Software\Classes\Directory\ContextMenus\List\Shell\Files]"MUIVerb"="Files"[HKEY_LOCAL_MACHINE\Software\Classes\Directory\ContextMenus\List\Shell\Files\Command]; powershell -executionPolicy bypass "%SystemRoot%\List.ps1" -type 'files' -directory '%1'@=hex(2):70,00,6f,00,77,00,65,00,72,00,73,00,68,00,65,00,6c,00,6c,00,20,00,2d,\  00,65,00,78,00,65,00,63,00,75,00,74,00,69,00,6f,00,6e,00,50,00,6f,00,6c,00,\  69,00,63,00,79,00,20,00,62,00,79,00,70,00,61,00,73,00,73,00,20,00,22,00,25,\  00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,\  4c,00,69,00,73,00,74,00,2e,00,70,00,73,00,31,00,22,00,20,00,2d,00,74,00,79,\  00,70,00,65,00,20,00,27,00,66,00,69,00,6c,00,65,00,73,00,27,00,20,00,2d,00,\  64,00,69,00,72,00,65,00,63,00,74,00,6f,00,72,00,79,00,20,00,27,00,25,00,31,\  00,27,00,00,00[HKEY_LOCAL_MACHINE\Software\Classes\Directory\ContextMenus\List\Shell\FilesRecursively]"MUIVerb"="Files recursively"[HKEY_LOCAL_MACHINE\Software\Classes\Directory\ContextMenus\List\Shell\FilesRecursively\Command]; powershell -executionPolicy bypass "%SystemRoot%\List.ps1" -type 'filesRecursively' -directory '%1'@=hex(2):70,00,6f,00,77,00,65,00,72,00,73,00,68,00,65,00,6c,00,6c,00,20,00,2d,\  00,65,00,78,00,65,00,63,00,75,00,74,00,69,00,6f,00,6e,00,50,00,6f,00,6c,00,\  69,00,63,00,79,00,20,00,62,00,79,00,70,00,61,00,73,00,73,00,20,00,22,00,25,\  00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,\  4c,00,69,00,73,00,74,00,2e,00,70,00,73,00,31,00,22,00,20,00,2d,00,74,00,79,\  00,70,00,65,00,20,00,27,00,66,00,69,00,6c,00,65,00,73,00,52,00,65,00,63,00,\  75,00,72,00,73,00,69,00,76,00,65,00,6c,00,79,00,27,00,20,00,2d,00,64,00,69,\  00,72,00,65,00,63,00,74,00,6f,00,72,00,79,00,20,00,27,00,25,00,31,00,27,00,\  00,00[HKEY_LOCAL_MACHINE\Software\Classes\Directory\ContextMenus\List\Shell\Tree]"MUIVerb"="Tree"[HKEY_LOCAL_MACHINE\Software\Classes\Directory\ContextMenus\List\Shell\Tree\Command]; powershell -executionPolicy bypass "%SystemRoot%\List.ps1" -type 'tree' -directory '%1'@=hex(2):70,00,6f,00,77,00,65,00,72,00,73,00,68,00,65,00,6c,00,6c,00,20,00,2d,\  00,65,00,78,00,65,00,63,00,75,00,74,00,69,00,6f,00,6e,00,50,00,6f,00,6c,00,\  69,00,63,00,79,00,20,00,62,00,79,00,70,00,61,00,73,00,73,00,20,00,22,00,25,\  00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,\  4c,00,69,00,73,00,74,00,2e,00,70,00,73,00,31,00,22,00,20,00,2d,00,74,00,79,\  00,70,00,65,00,20,00,27,00,74,00,72,00,65,00,65,00,27,00,20,00,2d,00,64,00,\  69,00,72,00,65,00,63,00,74,00,6f,00,72,00,79,00,20,00,27,00,25,00,31,00,27,\  00,00,00; Directory background.[HKEY_LOCAL_MACHINE\Software\Classes\Directory\Background\Shell\List]"MUIVerb"="List""ExtendedSubCommandsKey"="Directory\\Background\\ContextMenus\\List"[HKEY_LOCAL_MACHINE\Software\Classes\Directory\Background\ContextMenus\List\Shell\Files]"MUIVerb"="Files"[HKEY_LOCAL_MACHINE\Software\Classes\Directory\Background\ContextMenus\List\Shell\Files\Command]; powershell -executionPolicy bypass "%SystemRoot%\List.ps1" -type 'files' -directory '%V'@=hex(2):70,00,6f,00,77,00,65,00,72,00,73,00,68,00,65,00,6c,00,6c,00,20,00,2d,\  00,65,00,78,00,65,00,63,00,75,00,74,00,69,00,6f,00,6e,00,50,00,6f,00,6c,00,\  69,00,63,00,79,00,20,00,62,00,79,00,70,00,61,00,73,00,73,00,20,00,22,00,25,\  00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,\  4c,00,69,00,73,00,74,00,2e,00,70,00,73,00,31,00,22,00,20,00,2d,00,74,00,79,\  00,70,00,65,00,20,00,27,00,66,00,69,00,6c,00,65,00,73,00,27,00,20,00,2d,00,\  64,00,69,00,72,00,65,00,63,00,74,00,6f,00,72,00,79,00,20,00,27,00,25,00,56,\  00,27,00,00,00[HKEY_LOCAL_MACHINE\Software\Classes\Directory\Background\ContextMenus\List\Shell\FilesRecursively]"MUIVerb"="Files recursively"[HKEY_LOCAL_MACHINE\Software\Classes\Directory\Background\ContextMenus\List\Shell\FilesRecursively\Command]; powershell -executionPolicy bypass "%SystemRoot%\List.ps1" -type 'filesRecursively' -directory '%V'@=hex(2):70,00,6f,00,77,00,65,00,72,00,73,00,68,00,65,00,6c,00,6c,00,20,00,2d,\  00,65,00,78,00,65,00,63,00,75,00,74,00,69,00,6f,00,6e,00,50,00,6f,00,6c,00,\  69,00,63,00,79,00,20,00,62,00,79,00,70,00,61,00,73,00,73,00,20,00,22,00,25,\  00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,\  4c,00,69,00,73,00,74,00,2e,00,70,00,73,00,31,00,22,00,20,00,2d,00,74,00,79,\  00,70,00,65,00,20,00,27,00,66,00,69,00,6c,00,65,00,73,00,52,00,65,00,63,00,\  75,00,72,00,73,00,69,00,76,00,65,00,6c,00,79,00,27,00,20,00,2d,00,64,00,69,\  00,72,00,65,00,63,00,74,00,6f,00,72,00,79,00,20,00,27,00,25,00,56,00,27,00,\  00,00[HKEY_LOCAL_MACHINE\Software\Classes\Directory\Background\ContextMenus\List\Shell\Tree]"MUIVerb"="Tree"[HKEY_LOCAL_MACHINE\Software\Classes\Directory\Background\ContextMenus\List\Shell\Tree\Command]; powershell -executionPolicy bypass "%SystemRoot%\List.ps1" -type 'tree' -directory '%V'@=hex(2):70,00,6f,00,77,00,65,00,72,00,73,00,68,00,65,00,6c,00,6c,00,20,00,2d,\  00,65,00,78,00,65,00,63,00,75,00,74,00,69,00,6f,00,6e,00,50,00,6f,00,6c,00,\  69,00,63,00,79,00,20,00,62,00,79,00,70,00,61,00,73,00,73,00,20,00,22,00,25,\  00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,\  4c,00,69,00,73,00,74,00,2e,00,70,00,73,00,31,00,22,00,20,00,2d,00,74,00,79,\  00,70,00,65,00,20,00,27,00,74,00,72,00,65,00,65,00,27,00,20,00,2d,00,64,00,\  69,00,72,00,65,00,63,00,74,00,6f,00,72,00,79,00,20,00,27,00,25,00,56,00,27,\  00,00,00

List.ps1

function sortNaturally {    [Regex]::replace($_, '\d+', {        $args[0].value.padLeft(20)    })}function writeList {    param(        [parameter(mandatory = $true)]        [string] $text = $null    )    $filePath = "$env:temp\List.txt"    $text > "$filePath"    notepad "$filePath" | out-null    del "$filePath"}function listFiles {    param(        [switch] $recurse = $false    )    get-childItem -name -recurse:$recurse -force | sort-object $function:sortNaturally | out-string}function listTree {    tree /f}function getBufferText {    $rawUi = $host.ui.rawUi    $width = [Math]::max([Math]::max($rawUi.bufferSize.width, $rawUi.windowSize.width) - 1, 0)    $height = [Math]::max($rawUi.cursorPosition.y - 1, 0)    $lines = new-object System.Text.StringBuilder    $characters = new-object System.Text.StringBuilder    for ($h = 0; $h -lt $height; $h += 1) {        $rectangle = new-object System.Management.Automation.Host.Rectangle 0, $h, $width, $h        $buffer = $rawUi.getBufferContents($rectangle)        for ($w = 0; $w -lt $width; $w += 1) {            $cell = $buffer[0, $w]            $character = $cell.character            $characters.append($character) | out-null        }        $lines.appendLine($characters.toString()) | out-null        $characters.length = 0    }    $lines.toString() -replace '[ \0]*\r?\n', "`r`n"}function main {    param(        [parameter(mandatory = $true)]        [string] $type = $null,        [parameter(mandatory = $true)]        [string] $directory = $null    )    $outputEncoding = [Text.UTF8Encoding]::UTF8    [Console]::outputEncoding = [Text.UTF8Encoding]::UTF8    $PSDefaultParameterValues['out-file:encoding'] = 'utf8'    set-location -literalPath "$directory"    $typeFunction = @{        'files' = { writeList -text $(listFiles) };        'filesRecursively' = { writeList -text $(listFiles -recurse) };        'tree' = {            listTree            writeList -text $(getBufferText)        }    }    &($typeFunction.get_item($type))}main @args

If you output as non-Unicode (which you apparently do), you have to view the text file you create using the same encoding the Console window uses. That's why it looks correct in the console. In some text editors, you can choose an encoding (or "code page") when you open a file. (How to output as Unicode I don't know. cmd /U doesn't do what the documentation says.)

The Console encoding depends on your Windows installation. For me, it's "Western European (DOS)" (or just "MS-DOS") in Microsoft Word.