diff --git a/playbook/shopfloor-setup/gea-shopfloor-waxtrace/09-Setup-WaxAndTrace.ps1 b/playbook/shopfloor-setup/gea-shopfloor-waxtrace/09-Setup-WaxAndTrace.ps1
index 9112367..1421444 100644
--- a/playbook/shopfloor-setup/gea-shopfloor-waxtrace/09-Setup-WaxAndTrace.ps1
+++ b/playbook/shopfloor-setup/gea-shopfloor-waxtrace/09-Setup-WaxAndTrace.ps1
@@ -195,7 +195,15 @@ if (-not $asset) {
 
             $hasBrokenFilenames = $false
             if (Test-Path -LiteralPath $srcDataDir) {
-                $hasBrokenFilenames = [bool](Get-ChildItem -LiteralPath $srcDataDir -Filter '*[0-9] _*.txt' -ErrorAction SilentlyContinue | Select-Object -First 1)
+                # Get-ChildItem -Filter uses Win32 filtering and does NOT
+                # honor PowerShell wildcards / character classes - '[0-9]'
+                # would match literal bracketed text. Use -Include +
+                # Where-Object regex instead. The bug signature is
+                # ' _' (space-underscore) inside the filename, e.g.
+                # 'Linear_X_218-378-13 _100072210.txt'.
+                $hasBrokenFilenames = [bool](Get-ChildItem -LiteralPath $srcDataDir -File -ErrorAction SilentlyContinue |
+                    Where-Object { $_.Name -match ' _\d+\.txt$' } |
+                    Select-Object -First 1)
             }
 
             if ($hasBrokenFilenames) {