diff --git a/integration/agentcompat/internal/evidence/directory_permissions_windows_test.go b/integration/agentcompat/internal/evidence/directory_permissions_windows_test.go
new file mode 100644
index 00000000..8ec1bbef
--- /dev/null
+++ b/integration/agentcompat/internal/evidence/directory_permissions_windows_test.go
@@ -0,0 +1,31 @@
+//go:build windows
+
+package evidence
+
+import (
+	"os"
+	"testing"
+	"time"
+)
+
+func TestEvidence_WindowsPermissionValidationIgnoresSyntheticModes(t *testing.T) {
+	info := permissionTestFileInfo{mode: 0o666}
+
+	if err := validateEvidenceDirectoryMode(info); err != nil {
+		t.Fatalf("validate evidence directory: %v", err)
+	}
+	if err := validateEvidenceFileMode(info, "metadata.json"); err != nil {
+		t.Fatalf("validate evidence file: %v", err)
+	}
+}
+
+type permissionTestFileInfo struct {
+	mode os.FileMode
+}
+
+func (info permissionTestFileInfo) Name() string       { return "evidence" }
+func (info permissionTestFileInfo) Size() int64        { return 0 }
+func (info permissionTestFileInfo) Mode() os.FileMode  { return info.mode }
+func (info permissionTestFileInfo) ModTime() time.Time { return time.Time{} }
+func (info permissionTestFileInfo) IsDir() bool        { return false }
+func (info permissionTestFileInfo) Sys() any           { return nil }