Dont use astc on windows/limux yet

Source/Engine/Tools/TextureTool/TextureTool.Build.cs

@@ -58,8 +58,9 @@ public class TextureTool : EngineModule
                 options.PrivateDependencies.Add("bc7enc16");
             }
         }
-        if (options.Target.IsEditor)
+        if (options.Target.IsEditor && options.Platform.Target == TargetPlatform.Mac) // TODO: add ASTC for Editor on Linux and Windows
         {
+            // ASTC for mobile (iOS and Android)
             options.SourceFiles.Add(Path.Combine(FolderPath, "TextureTool.astc.cpp"));
             options.PrivateDependencies.Add("astc");
         }

Source/Engine/Tools/TextureTool/TextureTool.DirectXTex.cpp

@@ -834,6 +834,16 @@ bool TextureTool::ImportTextureDirectXTex(ImageType type, const StringView& path
 
 bool TextureTool::ConvertDirectXTex(TextureData& dst, const TextureData& src, const PixelFormat dstFormat)
 {
+    if (PixelFormatExtensions::IsCompressedASTC(dstFormat))
+    {
+        // TODO: decompress if need to
+#if COMPILE_WITH_ASTC
+        return ConvertAstc(dst, *textureData, dstFormat);
+#else
+        return true;
+#endif
+    }
+
     HRESULT result;
     DirectX::ScratchImage dstImage;
     DirectX::ScratchImage tmpImage;
@@ -919,10 +929,6 @@ bool TextureTool::ConvertDirectXTex(TextureData& dst, const TextureData& src, co
             return true;
         }
     }
-    else if (PixelFormatExtensions::IsCompressedASTC(dstFormat))
-    {
-        todo_astc_compression_on_windows;
-    }
     // Check if convert data
     else if (inImage->GetMetadata().format != dstFormatDxgi)
     {