gioxx · gioxx · Feb 2, 2026 · Jan 30, 2026
diff --git a/IntuneWinAppUtilGUI.psd1 b/IntuneWinAppUtilGUI.psd1
@@ -1,6 +1,6 @@
 @{
     RootModule           = 'IntuneWinAppUtilGUI.psm1'
-    ModuleVersion        = '1.0.6'
+    ModuleVersion        = '1.0.7'
     GUID                 = '7db79126-1b57-48d2-970a-4795692dfcfc'
     Author               = 'Giovanni Solone'
     Description          = 'GUI wrapper for IntuneWinAppUtil.exe with config file support and WPF interface.'
@@ -21,16 +21,9 @@
             LicenseUri   = 'https://opensource.org/licenses/MIT'
             IconUri      = 'https://raw.githubusercontent.com/gioxx/IntuneWinAppUtilGUI/main/Assets/icon.png'
             ReleaseNotes = @'
-- Bugfix: Delisted 1.0.4 from PowerShell Gallery and added again Show-IntuneWinAppUtilGUI to available commands.
-- Bugfix: Removed any reference to ZIP uploads as setup files.
-- Bugfix: Fixed PS 5.1 incompatibility in relative-path resolution ([System.IO.Path]::GetRelativePath is PS 7+).
-- Bugfix: Final filename (of IntuneWin package) is proposed also if AppVersion is not specified in Invoke-AppDeployToolkit.ps1.
-- Improved: Code cleanup, removed redundant GitHub download logic; refactoring.
-- Improved: Validates setup file existence and type.
-- Improved: Tries to create output folder when missing.
-- Improved: Ensures exactly one ".intunewin" extension on output.
-- Improved: If Source folder is not specified, it is inferred from Setup file.
-- Improved: Added more inline comments for maintainability.
+- Improved: Live Source/Output path length indicators.
+- Improved: On Run, warns if the longest file path under Source exceeds Windows limits, showing the longest path found.
+- Improved: Added UI note clarifying that Source path length is indicative and final check runs at packaging time.
 '@
         }
     }

diff --git a/Private/PathLengthHelpers.ps1 b/Private/PathLengthHelpers.ps1
@@ -0,0 +1,77 @@
+function Get-MaxFilePathInfo {
+    <#
+    .SYNOPSIS
+    Returns the longest full file path length under a root directory.
+    .DESCRIPTION
+    Enumerates files recursively and returns the maximum FullName length and the path.
+    If no files are found, returns the root path and its length.
+    .PARAMETER RootPath
+    The root directory to scan.
+    .OUTPUTS
+    PSCustomObject with Length and Path.
+    #>
+
+    [CmdletBinding()]
+    param([Parameter(Mandatory)][string] $RootPath)
+
+    try {
+        $maxLen = 0
+        $maxPath = $null
+        $foundAny = $false
+
+        foreach ($item in Get-ChildItem -Path $RootPath -Recurse -Force -File -ErrorAction SilentlyContinue) {
+            $len = $item.FullName.Length
+            if ($len -gt $maxLen) {
+                $maxLen = $len
+                $maxPath = $item.FullName
+            }
+            $foundAny = $true
+        }
+
+        if (-not $foundAny) {
+            $maxLen = $RootPath.Length
+            $maxPath = $RootPath
+        }
+
+        return [PSCustomObject]@{
+            Length = $maxLen
+            Path   = $maxPath
+        }
+    } catch {
+        return $null
+    }
+}
+
+function Update-PathLengthIndicator {
+    <#
+    .SYNOPSIS
+    Updates a TextBlock with path length info and warning color.
+    .PARAMETER PathText
+    The path text to measure.
+    .PARAMETER Indicator
+    The TextBlock to update.
+    .PARAMETER Limit
+    The max length threshold.
+    #>
+
+    [CmdletBinding()]
+    param(
+        [Parameter()][AllowEmptyString()][string] $PathText,
+        [Parameter(Mandatory)][System.Windows.Controls.TextBlock] $Indicator,
+        [Parameter(Mandatory)][int] $Limit
+    )
+
+    if (-not $Indicator) { return }
+    $len = if ($PathText) { $PathText.Length } else { 0 }
+    if ($len -gt 0) {
+        $Indicator.Visibility = [System.Windows.Visibility]::Visible
+        $Indicator.Text = "Path length: $len/$Limit"
+        $Indicator.Foreground = if ($len -gt $Limit) {
+            [System.Windows.Media.Brushes]::Red
+        } else {
+            [System.Windows.Media.Brushes]::Gray
+        }
+    } else {
+        $Indicator.Visibility = [System.Windows.Visibility]::Collapsed
+    }
+}
diff --git a/Public/Show-IntuneWinAppUtilGui.ps1 b/Public/Show-IntuneWinAppUtilGui.ps1
@@ -21,11 +21,13 @@ function Show-IntuneWinAppUtilGUI {
     if ([System.Threading.Thread]::CurrentThread.GetApartmentState() -ne 'STA') {
         $modulePath = $MyInvocation.MyCommand.Module.Path
         $shell = if ($PSVersionTable.PSEdition -eq 'Core') { 'pwsh' } else { 'powershell' }
+        $cmd = "Import-Module `"$modulePath`"; Show-IntuneWinAppUtilGUI"
+        if ($PSBoundParameters.ContainsKey('Debug')) { $cmd += " -Debug" }
         Start-Process $shell -ArgumentList @(
             '-NoProfile',
             '-STA',
-            '-Command', "Import-Module `"$modulePath`"; Show-IntuneWinAppUtilGUI"
-        ) | Out-Null
+            '-Command', $cmd
+        ) -NoNewWindow | Out-Null
         return
     }
 
@@ -72,6 +74,8 @@ function Show-IntuneWinAppUtilGUI {
     $SourceFolder    = $window.FindName("SourceFolder")
     $SetupFile       = $window.FindName("SetupFile")
     $OutputFolder    = $window.FindName("OutputFolder")
+    $SourceFolderPathLength = $window.FindName("SourceFolderPathLength")
+    $OutputFolderPathLength = $window.FindName("OutputFolderPathLength")
 
     $ToolPathBox     = $window.FindName("ToolPathBox")
     $ToolVersionText = $window.FindName("ToolVersionText")
@@ -88,11 +92,17 @@ function Show-IntuneWinAppUtilGUI {
     $ClearButton     = $window.FindName("ClearButton")
     $ExitButton      = $window.FindName("ExitButton")
 
+    $PathLengthLimit = 260
+
+    Update-PathLengthIndicator -PathText $SourceFolder.Text -Indicator $SourceFolderPathLength -Limit $PathLengthLimit
+    Update-PathLengthIndicator -PathText $OutputFolder.Text -Indicator $OutputFolderPathLength -Limit $PathLengthLimit
+
     # When user types/pastes the source path manually, try to auto-suggest the setup file if found.
     $SourceFolder.Add_TextChanged({
         param($evtSender, $e)
         $src = $SourceFolder.Text.Trim()
         if ($src) { Set-SetupFromSource -SourcePath $src -SetupFileControl $SetupFile -FinalFilenameControl $FinalFilename }
+        Update-PathLengthIndicator -PathText $SourceFolder.Text -Indicator $SourceFolderPathLength -Limit $PathLengthLimit
     })
 
     # Preload config.json if it exists
@@ -112,7 +122,6 @@ function Show-IntuneWinAppUtilGUI {
         try {
             if ($dialog.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) {
                 $SourceFolder.Text = $dialog.SelectedPath
-                Set-SetupFromSource -SourcePath $dialog.SelectedPath -SetupFileControl $SetupFile -FinalFilenameControl $FinalFilename
             }
         } finally {
             $dialog.Dispose()
@@ -161,6 +170,11 @@ function Show-IntuneWinAppUtilGUI {
         }
     })
 
+    $OutputFolder.Add_TextChanged({
+        param($evtSender, $e)
+        Update-PathLengthIndicator -PathText $OutputFolder.Text -Indicator $OutputFolderPathLength -Limit $PathLengthLimit
+    })
+
     # Browse for IntuneWinAppUtil.exe
     $BrowseTool.Add_Click({
         $dialog = New-Object System.Windows.Forms.OpenFileDialog
@@ -280,6 +294,27 @@ function Show-IntuneWinAppUtilGUI {
             return
         }
 
+        $pathWarnings = @()
+        if ($c.Length -gt $PathLengthLimit) { $pathWarnings += "Source folder: $($c.Length)/$PathLengthLimit" }
+        $maxFileInfo = Get-MaxFilePathInfo -RootPath $c
+        if ($null -ne $maxFileInfo -and $maxFileInfo.Length -gt $PathLengthLimit) {
+            $pathWarnings += "Max file path in source: $($maxFileInfo.Length)/$PathLengthLimit"
+            $pathWarnings += "Longest path: $($maxFileInfo.Path)"
+        }
+        if ($o.Length -gt $PathLengthLimit) { $pathWarnings += "Output folder: $($o.Length)/$PathLengthLimit" }
+        if ($pathWarnings.Count -gt 0) {
+            $msg = "One or more paths exceed $PathLengthLimit characters.`n`n" +
+                   ($pathWarnings -join "`n") +
+                   "`n`nThis can cause IntuneWinAppUtil to fail on Windows.`nProceed anyway?"
+            $confirm = [System.Windows.MessageBox]::Show(
+                $msg,
+                "Path length warning",
+                [System.Windows.MessageBoxButton]::YesNo,
+                [System.Windows.MessageBoxImage]::Warning
+            )
+            if ($confirm -ne [System.Windows.MessageBoxResult]::Yes) { return }
+        }
+
         # IntuneWinAppUtil.exe path check (or initialize/download if not set)
         $toolPath = Initialize-IntuneWinAppUtil -UiToolPath ($ToolPathBox.Text.Trim())
 

diff --git a/UI/UI.xaml b/UI/UI.xaml
@@ -53,6 +53,12 @@
                     <TextBox Name="SourceFolder" Grid.Column="0" Margin="0,0,10,0" Padding="4"/>
                     <Button Name="BrowseSource" Content="Browse..." Grid.Column="1" Width="80" Padding="2"/>
                 </Grid>
+                <TextBlock Name="SourceFolderPathLength"
+                           Text="Path length: 0/260"
+                           Foreground="Gray"
+                           FontSize="11"
+                           Margin="0,4,0,0"
+                           Visibility="Collapsed"/>
             </StackPanel>
 
             <!-- Setup File -->
@@ -86,6 +92,12 @@
                     <TextBox Name="OutputFolder" Grid.Column="0" Margin="0,0,10,0" Padding="4"/>
                     <Button Name="BrowseOutput" Content="Browse..." Grid.Column="1" Width="80" Padding="2"/>
                 </Grid>
+                <TextBlock Name="OutputFolderPathLength"
+                           Text="Path length: 0/260"
+                           Foreground="Gray"
+                           FontSize="11"
+                           Margin="0,4,0,0"
+                           Visibility="Collapsed"/>
             </StackPanel>
 
             <!-- Tool Path -->
@@ -149,7 +161,7 @@
 
             <!-- Info tooltip -->
             <TextBlock Grid.Row="6" Grid.Column="0" Grid.ColumnSpan="2"
-            Text="⚠️ Source folder, setup file and output folder are required (*).&#x0a;ℹ️ Final filename is optional and used for renaming the .intunewin file. If not provided, the tool will generate a name based on the source folder.&#x0a;ℹ️ IntuneWinAppUtil Path is also optional. If not provided, the tool will automatically download the latest version from GitHub.&#x0a;&#x0a;Press ESC on the keyboard to close the application.&#x0a;Click on 'Run' button or press ENTER on the keyboard to execute the IntuneWinAppUtil with the provided parameters."
+            Text="⚠️ Source folder, setup file and output folder are required (*).&#x0a;ℹ️ The Source folder path length shown above is indicative; the final check runs at packaging time (Run) and considers the longest file path.&#x0a;ℹ️ Final filename is optional and used for renaming the .intunewin file. If not provided, the tool will generate a name based on the source folder.&#x0a;ℹ️ IntuneWinAppUtil Path is also optional. If not provided, the tool will automatically download the latest version from GitHub.&#x0a;&#x0a;Press ESC on the keyboard to close the application.&#x0a;Click on 'Run' button or press ENTER on the keyboard to execute the IntuneWinAppUtil with the provided parameters."
             Foreground="Gray" FontSize="12" Margin="0,20,0,0" TextWrapping="Wrap"/>
 
             <!-- GitHub Link -->