diff -r ea891871f481 -r bb5522e88ab2 misc/libphysfs/lzma/CPP/7zip/UI/Common/WorkDir.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CPP/7zip/UI/Common/WorkDir.cpp	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,64 @@
+// WorkDir.cpp
+
+#include "StdAfx.h"
+
+#include "WorkDir.h"
+
+#include "Common/StringConvert.h"
+#include "Common/Wildcard.h"
+
+#include "Windows/FileName.h"
+#include "Windows/FileDir.h"
+
+static inline UINT GetCurrentCodePage() 
+  { return ::AreFileApisANSI() ? CP_ACP : CP_OEMCP; } 
+
+using namespace NWindows;
+using namespace NFile;
+using namespace NName;
+
+UString GetWorkDir(const NWorkDir::CInfo &workDirInfo, const UString &path)
+{
+  NWorkDir::NMode::EEnum mode = workDirInfo.Mode;
+  if (workDirInfo.ForRemovableOnly)
+  {
+    mode = NWorkDir::NMode::kCurrent;
+    UString prefix = path.Left(3);
+    if (prefix[1] == L':' && prefix[2] == L'\\')
+    {
+      UINT driveType = GetDriveType(GetSystemString(prefix, GetCurrentCodePage()));
+      if (driveType == DRIVE_CDROM || driveType == DRIVE_REMOVABLE)
+        mode = workDirInfo.Mode;
+    }
+    /*
+    CParsedPath parsedPath;
+    parsedPath.ParsePath(archiveName);
+    UINT driveType = GetDriveType(parsedPath.Prefix);
+    if ((driveType != DRIVE_CDROM) && (driveType != DRIVE_REMOVABLE))
+      mode = NZipSettings::NWorkDir::NMode::kCurrent;
+    */
+  }
+  switch(mode)
+  {
+    case NWorkDir::NMode::kCurrent:
+    {
+      return ExtractDirPrefixFromPath(path);
+    }
+    case NWorkDir::NMode::kSpecified:
+    {
+      UString tempDir = workDirInfo.Path;
+      NormalizeDirPathPrefix(tempDir);
+      return tempDir;
+    }
+    default:
+    {
+      UString tempDir;
+      if(!NFile::NDirectory::MyGetTempPath(tempDir))
+        throw 141717;
+      return tempDir;
+    }
+  }
+}
+
+
+