diff --git a/NanaZip.Codecs/NanaZip.Codecs.Archive.DotNetSingleFile.cpp b/NanaZip.Codecs/NanaZip.Codecs.Archive.DotNetSingleFile.cpp
index 31ef0594..f8e69f34 100644
--- a/NanaZip.Codecs/NanaZip.Codecs.Archive.DotNetSingleFile.cpp
+++ b/NanaZip.Codecs/NanaZip.Codecs.Archive.DotNetSingleFile.cpp
@@ -169,6 +169,7 @@ namespace NanaZip::Codecs::Archive
     private:
 
         IInStream* m_FileStream = nullptr;
+        std::uint64_t m_FullSize = 0;
         std::vector<BundleFileEntry> m_FilePaths;
         bool m_IsInitialized = false;
 
@@ -455,6 +456,7 @@ namespace NanaZip::Codecs::Archive
                         Current += RelativePathLength;
                         Files.emplace(Entry.RelativePath, Entry);
                     }
+                    this->m_FullSize = BundleHeaderOffset + Current;
                 }
                 catch (...)
                 {
@@ -464,7 +466,7 @@ namespace NanaZip::Codecs::Archive
                 HeaderBuffer.clear();
 
                 std::uint64_t TotalFiles = Files.size();
-                std::uint64_t TotalBytes = BundleSize;
+                std::uint64_t TotalBytes = this->m_FullSize;
 
                 if (OpenCallback)
                 {
@@ -496,6 +498,7 @@ namespace NanaZip::Codecs::Archive
         {
             this->m_IsInitialized = false;
             this->m_FilePaths.clear();
+            this->m_FullSize = 0;
             if (this->m_FileStream)
             {
                 this->m_FileStream->Release();
@@ -672,8 +675,6 @@ namespace NanaZip::Codecs::Archive
             _In_ PROPID PropId,
             _Inout_ LPPROPVARIANT Value)
         {
-            UNREFERENCED_PARAMETER(PropId);
-
             if (!this->m_IsInitialized)
             {
                 return S_FALSE;
@@ -684,6 +685,18 @@ namespace NanaZip::Codecs::Archive
                 return E_INVALIDARG;
             }
 
+            switch (PropId)
+            {
+            case SevenZipArchivePhysicalSize:
+            {
+                Value->uhVal.QuadPart = this->m_FullSize;
+                Value->vt = VT_UI8;
+                break;
+            }
+            default:
+                break;
+            }
+
             return S_OK;
         }