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flutter_app/build_sfx.ps1

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+# rmtPocketWatcher Self-Extracting Executable Builder
+# Creates a single .exe that extracts and runs the app
+
+$ErrorActionPreference = "Stop"
+
+$7zPath = "${env:ProgramFiles}\7-Zip\7z.exe"
+if (-not (Test-Path $7zPath)) {
+    $7zPath = "${env:ProgramFiles(x86)}\7-Zip\7z.exe"
+}
+if (-not (Test-Path $7zPath)) {
+    Write-Error "7-Zip not found. Please install 7-Zip from https://7-zip.org"
+    exit 1
+}
+
+$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+$StandaloneDir = Join-Path $ScriptDir "build\windows\standalone"
+$OutputDir = Join-Path $ScriptDir "build\windows\sfx"
+$SfxModule = "${env:ProgramFiles}\7-Zip\7z.sfx"
+$PubspecPath = Join-Path $ScriptDir "pubspec.yaml"
+
+if (-not (Test-Path $StandaloneDir)) {
+    Write-Error "Standalone build not found. Run build_windows.ps1 first."
+    exit 1
+}
+
+Write-Host "Creating self-extracting executable..." -ForegroundColor Green
+
+# Create output directory
+if (Test-Path $OutputDir) { Remove-Item -Recurse -Force $OutputDir }
+New-Item -ItemType Directory -Path $OutputDir -Force | Out-Null
+
+# Create SFX config file - silent extract to AppData and run
+$SfxConfig = @"
+;!@Install@!UTF-8!
+Title="rmtPocketWatcher"
+InstallPath="%LOCALAPPDATA%\\rmtPocketWatcher"
+RunProgram="rmtpocketwatcher.exe"
+GUIMode="2"
+OverwriteMode="2"
+;!@InstallEnd@!
+"@
+
+$SfxConfigPath = "$OutputDir\sfx_config.txt"
+$SfxConfig | Out-File -FilePath $SfxConfigPath -Encoding UTF8
+
+# Create 7z archive of standalone folder
+$ArchivePath = "$OutputDir\app.7z"
+Write-Host "Compressing application..." -ForegroundColor Yellow
+& $7zPath a -t7z -mx=9 -mf=BCJ2 -r $ArchivePath "$StandaloneDir\*" | Out-Null
+
+if (-not (Test-Path $ArchivePath)) {
+    Write-Error "Failed to create archive"
+    exit 1
+}
+
+# Combine SFX module + config + archive
+$Version = (Select-String -Path $PubspecPath -Pattern "^version: (.+)$").Matches[0].Groups[1].Value -replace '\+.*', ''
+$SfxExePath = "$OutputDir\rmtPocketWatcher-v$Version-Portable.exe"
+
+Write-Host "Building self-extracting executable..." -ForegroundColor Yellow
+
+# Read binary files and concatenate
+$sfxBytes = [System.IO.File]::ReadAllBytes($SfxModule)
+$configBytes = [System.IO.File]::ReadAllBytes($SfxConfigPath)
+$archiveBytes = [System.IO.File]::ReadAllBytes($ArchivePath)
+
+$outputStream = [System.IO.File]::Create($SfxExePath)
+$outputStream.Write($sfxBytes, 0, $sfxBytes.Length)
+$outputStream.Write($configBytes, 0, $configBytes.Length)
+$outputStream.Write($archiveBytes, 0, $archiveBytes.Length)
+$outputStream.Close()
+
+# Cleanup temp files
+Remove-Item $SfxConfigPath -Force
+Remove-Item $ArchivePath -Force
+
+$FileSize = [math]::Round((Get-Item $SfxExePath).Length / 1MB, 2)
+Write-Host "`n✅ Self-extracting executable created!" -ForegroundColor Green
+Write-Host "   File: $SfxExePath" -ForegroundColor Cyan
+Write-Host "   Size: $FileSize MB" -ForegroundColor Cyan
+Write-Host "`nThis single .exe can be distributed and run on any Windows PC." -ForegroundColor Yellow