Update AbstractPathHelpers.cs

Author: d2dyno1

src/Core/SecureFolderFS.Core.FileSystem/Helpers/Paths/Abstract/AbstractPathHelpers.cs

@@ -33,15 +33,19 @@ public static ReadOnlySpan<char> RemoveCiphertextExtension(string ciphertextName
 
             // Only normalize if needed. APFS/Android layers NFD-decompose Base4K codepoints,
             // but Dokany/WinFsp deliver names in a form where NFC recomposition breaks lookup.
-            // IsNormalized() lets the string itself determine whether normalization is safe.
-            if (!nameWithoutExtension.IsNormalized(NormalizationForm.FormC))
+            if (OperatingSystem.IsAndroid() || OperatingSystem.IsIOS() || OperatingSystem.IsMacOS() || OperatingSystem.IsMacCatalyst())
             {
-                var normalizedLength = nameWithoutExtension.GetNormalizedLength(NormalizationForm.FormC);
-                var normalized = new char[normalizedLength];
+                // IsNormalized() lets the string itself determine whether normalization is safe.
+                // TODO: Fix normalization in Vault V4
+                if (!nameWithoutExtension.IsNormalized(NormalizationForm.FormC))
+                {
+                    var normalizedLength = nameWithoutExtension.GetNormalizedLength(NormalizationForm.FormC);
+                    var normalized = new char[normalizedLength];
 
-                // NFC-normalize before decoding
-                if (nameWithoutExtension.TryNormalize(normalized, out var written, NormalizationForm.FormC))
-                    return normalized.AsSpan(0, written);
+                    // NFC-normalize before decoding
+                    if (nameWithoutExtension.TryNormalize(normalized, out var written, NormalizationForm.FormC))
+                        return normalized.AsSpan(0, written);
+                }
             }
 
             return nameWithoutExtension;