diff -r ea891871f481 -r bb5522e88ab2 misc/libphysfs/lzma/CPP/7zip/UI/Common/ArchiveName.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CPP/7zip/UI/Common/ArchiveName.cpp	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,46 @@
+// ArchiveName.cpp
+
+#include "StdAfx.h"
+
+#include "Windows/FileFind.h"
+#include "Windows/FileDir.h"
+
+using namespace NWindows;
+
+UString CreateArchiveName(const UString &srcName, bool fromPrev, bool keepName)
+{
+  UString resultName = L"Archive";
+  if (fromPrev)
+  {
+    UString dirPrefix;
+    if (NFile::NDirectory::GetOnlyDirPrefix(srcName, dirPrefix))
+    {
+      if (dirPrefix.Length() > 0)
+        if (dirPrefix[dirPrefix.Length() - 1] == '\\')
+        {
+          dirPrefix.Delete(dirPrefix.Length() - 1);
+          NFile::NFind::CFileInfoW fileInfo;
+          if (NFile::NFind::FindFile(dirPrefix, fileInfo))
+            resultName = fileInfo.Name;
+        }
+    }
+  }
+  else
+  {
+    NFile::NFind::CFileInfoW fileInfo;
+    if (!NFile::NFind::FindFile(srcName, fileInfo))
+      return resultName;
+    resultName = fileInfo.Name;
+    if (!fileInfo.IsDirectory() && !keepName)
+    {
+      int dotPos = resultName.ReverseFind('.');
+      if (dotPos > 0)
+      {
+        UString archiveName2 = resultName.Left(dotPos);
+        if (archiveName2.ReverseFind('.') < 0)
+          resultName = archiveName2;
+      }
+    }
+  }
+  return resultName;
+}