diff --git a/NanaZip.Codecs/NanaZip.Codecs.Archive.WebAssembly.cpp b/NanaZip.Codecs/NanaZip.Codecs.Archive.WebAssembly.cpp
index 499a2ccd..b7769c34 100644
--- a/NanaZip.Codecs/NanaZip.Codecs.Archive.WebAssembly.cpp
+++ b/NanaZip.Codecs/NanaZip.Codecs.Archive.WebAssembly.cpp
@@ -335,6 +335,10 @@ namespace NanaZip::Codecs::Archive
                     Sections.emplace(Section.Name, Section);
                     i += Size;
                 }
+                if (!this->m_FullSize && !Sections.empty())
+                {
+                    this->m_FullSize = BundleSize;
+                }
 
                 std::uint64_t TotalFiles = Sections.size();
                 std::uint64_t TotalBytes = this->m_FullSize;
@@ -551,8 +555,6 @@ namespace NanaZip::Codecs::Archive
             _In_ PROPID PropId,
             _Inout_ LPPROPVARIANT Value)
         {
-            UNREFERENCED_PARAMETER(PropId);
-
             if (!this->m_IsInitialized)
             {
                 return S_FALSE;
@@ -563,6 +565,18 @@ 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;
         }