diff --git a/docs/DEVELOPMENT.md b/docs/DEVELOPMENT.md
index 9dfb547..d119034 100644
--- a/docs/DEVELOPMENT.md
+++ b/docs/DEVELOPMENT.md
@@ -302,6 +302,14 @@ in the same file; a dedicated server prints its folder at start
 (`--log-dir`). Users send theirs with Settings → About → "Copy
 diagnostics".
 
+A Windows friend without a terminal habit: `tool/windows_report.cmd`
+(one file: a cmd header that runs the PowerShell below it). Dropped into
+the Starsync folder and double-clicked, it collects the app's logs,
+Windows' crash events (1000/1001/1026), that install's file list (and
+any other found on Desktop, Downloads, Documents, AppData, Program
+Files) and a 20 s test start with its exit code, zips them to the
+Desktop and copies the zip (Ctrl+V into Discord).
+
 Start with the session log when there is one: `session-YYYY-MM-DD.log`
 in the server's folder (the hosting app's logs folder, or the dedicated
 server's `--log-dir`), every member's lines and the server's merged in
diff --git a/tool/windows_report.cmd b/tool/windows_report.cmd
new file mode 100644
index 0000000..8df6aad
--- /dev/null
+++ b/tool/windows_report.cmd
@@ -0,0 +1,80 @@
+@echo off
+rem Starsync crash report: put this file in the Starsync folder (next to
+rem starsync.exe or watch_together.exe) and double-click it. It makes
+rem starsync-report.zip on the Desktop and copies it: Ctrl+V in Discord.
+set "STARSYNC_REPORT_DIR=%~dp0"
+powershell -NoProfile -ExecutionPolicy Bypass -Command "$s = Get-Content -LiteralPath '%~f0' -Raw; iex $s.Substring($s.IndexOf('#STAR' + 'SYNC-PS'))"
+echo.
+pause
+exit /b
+#STARSYNC-PS
+# Starsync crash report (run windows_report.cmd from the Starsync folder): collects logs, crash events and a test start, zips
+# them to the Desktop and puts the zip on the clipboard (Ctrl+V in Discord).
+$ErrorActionPreference = 'SilentlyContinue'
+$o = Join-Path $env:TEMP 'starsync-report'
+Remove-Item -Recurse -Force $o
+New-Item -ItemType Directory $o | Out-Null
+$info = Join-Path $o 'info.txt'
+function Say($s) { Add-Content -Path $info -Value $s }
+
+Say ('Report ' + (Get-Date -Format s))
+Say ((Get-CimInstance Win32_OperatingSystem | Select-Object Caption, Version, OSArchitecture | Format-List | Out-String).Trim())
+Say ((Get-CimInstance Win32_VideoController | Select-Object Name, DriverVersion | Format-List | Out-String).Trim())
+
+# The app's logs (new and old data folders), newest first.
+$logs = Get-ChildItem -Path "$env:APPDATA\*\*\logs\*" -Include 'app-*', 'diagnostics-*', 'session-*', 'server-*' |
+  Sort-Object LastWriteTime -Descending | Select-Object -First 10
+foreach ($l in $logs) {
+  $dest = Join-Path $o ($l.Directory.Parent.Name + '_' + $l.Name)
+  Copy-Item $l.FullName $dest
+}
+Say ''
+Say 'Data folders:'
+Get-ChildItem -Path "$env:APPDATA\*\*" -Directory | Where-Object { $_.Name -match 'starsync|watch' } |
+  ForEach-Object { Say ('  ' + $_.FullName) }
+
+# Windows' own crash records for the app.
+Get-WinEvent -FilterHashtable @{ LogName = 'Application'; Id = 1000, 1001, 1026; StartTime = (Get-Date).AddDays(-3) } |
+  Where-Object { $_.Message -match 'starsync|watch_together' } |
+  Format-List TimeCreated, Id, ProviderName, Message | Out-File (Join-Path $o 'crash-events.txt') -Width 300
+
+# Every install found: its files, and one test start of starsync.exe.
+$roots = @([Environment]::GetFolderPath('Desktop'), "$env:USERPROFILE\Downloads", "$env:USERPROFILE\Desktop", $env:LOCALAPPDATA, $env:ProgramFiles, "$env:USERPROFILE\Documents") | Select-Object -Unique
+$exes = foreach ($r in $roots) { Get-ChildItem -Path $r -Recurse -Depth 3 -Include 'starsync.exe', 'watch_together.exe' -File }
+# The folder this report was started from comes first.
+$here = $env:STARSYNC_REPORT_DIR
+if ($here) { $here = $here.TrimEnd('\') }
+$dirs = @($here) + ($exes | ForEach-Object { $_.DirectoryName }) |
+  Where-Object { $_ -and ((Test-Path (Join-Path $_ 'starsync.exe')) -or (Test-Path (Join-Path $_ 'watch_together.exe'))) } |
+  Select-Object -Unique
+foreach ($d in $dirs) {
+  Say ''
+  Say ('Install: ' + $d)
+  Get-ChildItem -Path $d -Recurse -File | ForEach-Object {
+    Say ('  ' + $_.FullName.Substring($d.Length) + '  ' + $_.Length + '  ' + $_.LastWriteTime.ToString('s'))
+  }
+  $exe = Join-Path $d 'starsync.exe'
+  if (-not (Test-Path $exe)) { $exe = Join-Path $d 'watch_together.exe' }
+  $p = Start-Process -FilePath $exe -WorkingDirectory $d -PassThru
+  Start-Sleep -Seconds 20
+  if ($p.HasExited) {
+    Say ('Test start of ' + $exe + ': exited, code ' + $p.ExitCode + ' (0x' + ('{0:X8}' -f $p.ExitCode) + ')')
+  } else {
+    Say ('Test start of ' + $exe + ': still running after 20 s')
+    Stop-Process -Id $p.Id -Force
+  }
+}
+if (-not $dirs) { Say 'No starsync.exe or watch_together.exe found on Desktop, Downloads, Documents, AppData or Program Files.' }
+
+# Logs written by the test start.
+Get-ChildItem -Path "$env:APPDATA\*\*\logs\*" -Include 'app-*' | Where-Object { $_.LastWriteTime -gt (Get-Date).AddMinutes(-2) } |
+  ForEach-Object { Copy-Item $_.FullName (Join-Path $o ('after-test_' + $_.Name)) }
+
+$zip = Join-Path ([Environment]::GetFolderPath('Desktop')) 'starsync-report.zip'
+Remove-Item -Force $zip
+Compress-Archive -Path "$o\*" -DestinationPath $zip
+Set-Clipboard -Path $zip
+Start-Process explorer.exe -ArgumentList "/select,`"$zip`""
+Write-Host ''
+Write-Host 'Done: starsync-report.zip is on your Desktop and copied.' -ForegroundColor Green
+Write-Host 'Open Discord and press Ctrl+V to send it.' -ForegroundColor Green