1 files changed, 16 insertions, 2 deletions
diff --git a/CPP/7zip/UI/Common/SetProperties.cpp b/CPP/7zip/UI/Common/SetProperties.cpp
index b1434ace..201e95b5 100755
--- a/CPP/7zip/UI/Common/SetProperties.cpp
+++ b/CPP/7zip/UI/Common/SetProperties.cpp
@@ -44,9 +44,23 @@ HRESULT SetProperties(IUnknown *unknown, const CObjectVector<CProperty> &propert
     {
       const CProperty &property = properties[i];
       NCOM::CPropVariant propVariant;
-      if (!property.Value.IsEmpty())
+      UString name = property.Name;
+      if (property.Value.IsEmpty())
+      {
+        if (!name.IsEmpty())
+        {
+          wchar_t c = name[name.Length() - 1];
+          if (c == L'-')
+            propVariant = false;
+          else if (c == L'+')
+            propVariant = true;
+          if (propVariant.vt != VT_EMPTY)
+            name = name.Left(name.Length() - 1);
+        }
+      }
+      else
         ParseNumberString(property.Value, propVariant);
-      realNames.Add(property.Name);
+      realNames.Add(name);
       values[i] = propVariant;
     }
     CRecordVector<const wchar_t *> names;