diff --git a/src/common/cd_image_bin.cpp b/src/common/cd_image_bin.cpp
index c84710175..f62d48f40 100644
--- a/src/common/cd_image_bin.cpp
+++ b/src/common/cd_image_bin.cpp
@@ -25,17 +25,6 @@ private:
   CDSubChannelReplacement m_sbi;
 };
 
-static std::string ReplaceExtension(std::string_view path, std::string_view new_extension)
-{
-  std::string_view::size_type pos = path.rfind('.');
-  if (pos == std::string::npos)
-    return std::string(path);
-
-  std::string ret(path, 0, pos + 1);
-  ret.append(new_extension);
-  return ret;
-}
-
 CDImageBin::CDImageBin() = default;
 
 CDImageBin::~CDImageBin()
@@ -101,7 +90,7 @@ bool CDImageBin::Open(const char* filename)
 
   AddLeadOutIndex();
 
-  m_sbi.LoadSBI(ReplaceExtension(filename, "sbi").c_str());
+  m_sbi.LoadSBI(FileSystem::ReplaceExtension(filename, "sbi").c_str());
 
   return Seek(1, Position{0, 0, 0});
 }
diff --git a/src/common/cd_image_memory.cpp b/src/common/cd_image_memory.cpp
index 54a85a692..c3e38cb0b 100644
--- a/src/common/cd_image_memory.cpp
+++ b/src/common/cd_image_memory.cpp
@@ -110,20 +110,7 @@ bool CDImageMemory::CopyImage(CDImage* image, ProgressCallback* progress)
   m_filename = image->GetFileName();
   m_lba_count = image->GetLBACount();
 
-  if (!image->Seek(0))
-  {
-    progress->ModalError("Failed to seek to start of image for subq read");
-    return false;
-  }
-
-  progress->SetStatusText("Looking for invalid subchannel data...");
-
-  CDImage::SubChannelQ subq;
-  for (LBA lba = 0; lba < m_lba_count; lba++)
-  {
-    if (ReadSubChannelQ(&subq) && !subq.IsCRCValid())
-      m_sbi.AddReplacementSubChannelQ(lba, subq);
-  }
+  m_sbi.LoadSBI(FileSystem::ReplaceExtension(m_filename, "sbi").c_str());
 
   return Seek(1, Position{0, 0, 0});
 }