diff --git a/Aaru.Images/BlindWrite5/Read.cs b/Aaru.Images/BlindWrite5/Read.cs
index 0fc50ee3e..dd3dffd04 100644
--- a/Aaru.Images/BlindWrite5/Read.cs
+++ b/Aaru.Images/BlindWrite5/Read.cs
@@ -840,11 +840,15 @@ public sealed partial class BlindWrite5
                                            .ToList();
 
                 if(fileCharsForThisTrack.Count == 0 &&
-                   _filePaths.Any(static f => Path.GetExtension(f.FilePath).ToLowerInvariant() == ".b00"))
+                   _filePaths.Any(static f => string.Equals(Path.GetExtension(f.FilePath),
+                                                            ".b00",
+                                                            StringComparison.InvariantCultureIgnoreCase)))
                 {
                     DataFileCharacteristics splitStartChars =
-                        _filePaths.FirstOrDefault(static f => Path.GetExtension(f.FilePath).ToLowerInvariant() ==
-                                                              ".b00");
+                        _filePaths.FirstOrDefault(static f => string.Equals(Path.GetExtension(f.FilePath),
+                                                                            ".b00",
+                                                                            StringComparison
+                                                                               .InvariantCultureIgnoreCase));
 
                     string filename           = Path.GetFileNameWithoutExtension(splitStartChars.FilePath);
                     var    lowerCaseExtension = false;