diff --git a/Source/Core/Common/NandPaths.cpp b/Source/Core/Common/NandPaths.cpp
index b670be635d..336c1bb7bb 100644
--- a/Source/Core/Common/NandPaths.cpp
+++ b/Source/Core/Common/NandPaths.cpp
@@ -21,41 +21,46 @@ std::string RootUserPath(FromWhichRoot from)
   return File::GetUserPath(idx);
 }
 
-std::string GetImportTitlePath(u64 title_id, FromWhichRoot from)
+static std::string RootUserPath(std::optional<FromWhichRoot> from)
+{
+  return from ? RootUserPath(*from) : "";
+}
+
+std::string GetImportTitlePath(u64 title_id, std::optional<FromWhichRoot> from)
 {
   return RootUserPath(from) + StringFromFormat("/import/%08x/%08x",
                                                static_cast<u32>(title_id >> 32),
                                                static_cast<u32>(title_id));
 }
 
-std::string GetTicketFileName(u64 title_id, FromWhichRoot from)
+std::string GetTicketFileName(u64 title_id, std::optional<FromWhichRoot> from)
 {
   return StringFromFormat("%s/ticket/%08x/%08x.tik", RootUserPath(from).c_str(),
                           static_cast<u32>(title_id >> 32), static_cast<u32>(title_id));
 }
 
-std::string GetTitlePath(u64 title_id, FromWhichRoot from)
+std::string GetTitlePath(u64 title_id, std::optional<FromWhichRoot> from)
 {
-  return StringFromFormat("%s/title/%08x/%08x/", RootUserPath(from).c_str(),
+  return StringFromFormat("%s/title/%08x/%08x", RootUserPath(from).c_str(),
                           static_cast<u32>(title_id >> 32), static_cast<u32>(title_id));
 }
 
-std::string GetTitleDataPath(u64 title_id, FromWhichRoot from)
+std::string GetTitleDataPath(u64 title_id, std::optional<FromWhichRoot> from)
 {
-  return GetTitlePath(title_id, from) + "data/";
+  return GetTitlePath(title_id, from) + "/data";
 }
 
-std::string GetTitleContentPath(u64 title_id, FromWhichRoot from)
+std::string GetTitleContentPath(u64 title_id, std::optional<FromWhichRoot> from)
 {
-  return GetTitlePath(title_id, from) + "content/";
+  return GetTitlePath(title_id, from) + "/content";
 }
 
-std::string GetTMDFileName(u64 title_id, FromWhichRoot from)
+std::string GetTMDFileName(u64 title_id, std::optional<FromWhichRoot> from)
 {
-  return GetTitleContentPath(title_id, from) + "title.tmd";
+  return GetTitleContentPath(title_id, from) + "/title.tmd";
 }
 
-bool IsTitlePath(const std::string& path, FromWhichRoot from, u64* title_id)
+bool IsTitlePath(const std::string& path, std::optional<FromWhichRoot> from, u64* title_id)
 {
   std::string expected_prefix = RootUserPath(from) + "/title/";
   if (!StringBeginsWith(path, expected_prefix))
diff --git a/Source/Core/Common/NandPaths.h b/Source/Core/Common/NandPaths.h
index 5a1dcffce4..068a240f43 100644
--- a/Source/Core/Common/NandPaths.h
+++ b/Source/Core/Common/NandPaths.h
@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <optional>
 #include <string>
 
 #include "Common/CommonTypes.h"
@@ -18,17 +19,22 @@ enum FromWhichRoot
 
 std::string RootUserPath(FromWhichRoot from);
 
-// Returns /import/%08x/%08x. Intended for use by ES.
-std::string GetImportTitlePath(u64 title_id, FromWhichRoot from = FROM_SESSION_ROOT);
+// The following functions return paths relative to the NAND root.
+// If a FromWhichRoot is passed, the NAND root on the host filesystem will be prepended to the path.
+// TODO: remove the from parameter after all code is migrated off direct FS access.
 
-std::string GetTicketFileName(u64 title_id, FromWhichRoot from);
-std::string GetTitlePath(u64 title_id, FromWhichRoot from);
-std::string GetTitleDataPath(u64 title_id, FromWhichRoot from);
-std::string GetTitleContentPath(u64 title_id, FromWhichRoot from);
-std::string GetTMDFileName(u64 title_id, FromWhichRoot from);
+// Returns /import/%08x/%08x. Intended for use by ES.
+std::string GetImportTitlePath(u64 title_id, std::optional<FromWhichRoot> from = {});
+
+std::string GetTicketFileName(u64 title_id, std::optional<FromWhichRoot> from = {});
+std::string GetTitlePath(u64 title_id, std::optional<FromWhichRoot> from = {});
+std::string GetTitleDataPath(u64 title_id, std::optional<FromWhichRoot> from = {});
+std::string GetTitleContentPath(u64 title_id, std::optional<FromWhichRoot> from = {});
+std::string GetTMDFileName(u64 title_id, std::optional<FromWhichRoot> from = {});
 
 // Returns whether a path is within an installed title's directory.
-bool IsTitlePath(const std::string& path, FromWhichRoot from, u64* title_id = nullptr);
+bool IsTitlePath(const std::string& path, std::optional<FromWhichRoot> from = {},
+                 u64* title_id = nullptr);
 
 // Escapes characters that are invalid or have special meanings in the host file system
 std::string EscapeFileName(const std::string& filename);
diff --git a/Source/Core/Core/Boot/Boot.cpp b/Source/Core/Core/Boot/Boot.cpp
index f93b584251..d38ec6ad59 100644
--- a/Source/Core/Core/Boot/Boot.cpp
+++ b/Source/Core/Core/Boot/Boot.cpp
@@ -472,7 +472,7 @@ void StateFlags::UpdateChecksum()
 void UpdateStateFlags(std::function<void(StateFlags*)> update_function)
 {
   const std::string file_path =
-      Common::GetTitleDataPath(Titles::SYSTEM_MENU, Common::FROM_SESSION_ROOT) + WII_STATE;
+      Common::GetTitleDataPath(Titles::SYSTEM_MENU, Common::FROM_SESSION_ROOT) + "/" WII_STATE;
 
   File::IOFile file;
   StateFlags state;
diff --git a/Source/Core/Core/Boot/Boot_BS2Emu.cpp b/Source/Core/Core/Boot/Boot_BS2Emu.cpp
index f426175e58..dc4d5b91e8 100644
--- a/Source/Core/Core/Boot/Boot_BS2Emu.cpp
+++ b/Source/Core/Core/Boot/Boot_BS2Emu.cpp
@@ -227,7 +227,7 @@ bool CBoot::SetupWiiMemory()
   SettingsHandler gen;
   std::string serno;
   const std::string settings_file_path(
-      Common::GetTitleDataPath(Titles::SYSTEM_MENU, Common::FROM_SESSION_ROOT) + WII_SETTING);
+      Common::GetTitleDataPath(Titles::SYSTEM_MENU, Common::FROM_SESSION_ROOT) + "/" WII_SETTING);
   if (File::Exists(settings_file_path) && gen.Open(settings_file_path))
   {
     serno = gen.GetValue("SERNO");
@@ -328,7 +328,7 @@ bool CBoot::SetupWiiMemory()
 static void WriteEmptyPlayRecord()
 {
   const std::string file_path =
-      Common::GetTitleDataPath(Titles::SYSTEM_MENU, Common::FROM_SESSION_ROOT) + "play_rec.dat";
+      Common::GetTitleDataPath(Titles::SYSTEM_MENU, Common::FROM_SESSION_ROOT) + "/play_rec.dat";
   File::IOFile playrec_file(file_path, "r+b");
   std::vector<u8> empty_record(0x80);
   playrec_file.WriteBytes(empty_record.data(), empty_record.size());
diff --git a/Source/Core/Core/HW/WiiSaveCrypted.cpp b/Source/Core/Core/HW/WiiSaveCrypted.cpp
index 835ff9b980..28c9150b34 100644
--- a/Source/Core/Core/HW/WiiSaveCrypted.cpp
+++ b/Source/Core/Core/HW/WiiSaveCrypted.cpp
@@ -181,7 +181,7 @@ void CWiiSaveCrypted::ReadHDR()
     m_valid = false;
     return;
   }
-  std::string banner_file_path = m_wii_title_path + "banner.bin";
+  std::string banner_file_path = m_wii_title_path + "/banner.bin";
   if (!File::Exists(banner_file_path) ||
       AskYesNoT("%s already exists. Consider making a backup of the current save files before "
                 "overwriting.\nOverwrite now?",
@@ -203,7 +203,7 @@ void CWiiSaveCrypted::WriteHDR()
     return;
   memset(&m_header, 0, HEADER_SZ);
 
-  std::string banner_file_path = m_wii_title_path + "banner.bin";
+  std::string banner_file_path = m_wii_title_path + "/banner.bin";
   u32 banner_size = static_cast<u32>(File::GetSize(banner_file_path));
   m_header.hdr.BannerSize = Common::swap32(banner_size);
 
@@ -347,7 +347,7 @@ void CWiiSaveCrypted::ImportWiiSaveFiles()
       // Special characters in path components will be escaped such as /../
       std::string file_path = Common::EscapePath(reinterpret_cast<const char*>(file_hdr_tmp.name));
 
-      std::string file_path_full = m_wii_title_path + file_path;
+      std::string file_path_full = m_wii_title_path + '/' + file_path;
       File::CreateFullPath(file_path_full);
       const File::FileInfo file_info(file_path_full);
       if (file_hdr_tmp.type == 1)
@@ -585,7 +585,7 @@ bool CWiiSaveCrypted::getPaths(bool for_export)
       return false;
     }
 
-    if (!File::Exists(m_wii_title_path + "banner.bin"))
+    if (!File::Exists(m_wii_title_path + "/banner.bin"))
     {
       m_valid = false;
       ERROR_LOG(CONSOLE, "No banner file found for title %s", game_id);
diff --git a/Source/Core/Core/IOS/ES/NandUtils.cpp b/Source/Core/Core/IOS/ES/NandUtils.cpp
index 06c6efdf29..1b332bf97b 100644
--- a/Source/Core/Core/IOS/ES/NandUtils.cpp
+++ b/Source/Core/Core/IOS/ES/NandUtils.cpp
@@ -42,7 +42,8 @@ static IOS::ES::TMDReader FindTMD(u64 title_id, const std::string& tmd_path)
 
 IOS::ES::TMDReader ES::FindImportTMD(u64 title_id) const
 {
-  return FindTMD(title_id, Common::GetImportTitlePath(title_id) + "/content/title.tmd");
+  return FindTMD(title_id, Common::GetImportTitlePath(title_id, Common::FROM_SESSION_ROOT) +
+                               "/content/title.tmd");
 }
 
 IOS::ES::TMDReader ES::FindInstalledTMD(u64 title_id) const
@@ -218,7 +219,8 @@ bool ES::InitImport(u64 title_id)
   // IOS moves the title content directory to /import if the TMD exists during an import.
   if (File::Exists(Common::GetTMDFileName(title_id, Common::FROM_SESSION_ROOT)))
   {
-    const std::string import_content_dir = Common::GetImportTitlePath(title_id) + "/content";
+    const std::string import_content_dir =
+        Common::GetImportTitlePath(title_id, Common::FROM_SESSION_ROOT) + "/content";
     File::CreateFullPath(import_content_dir);
     if (!File::Rename(content_dir, import_content_dir))
     {
@@ -233,7 +235,8 @@ bool ES::InitImport(u64 title_id)
 bool ES::FinishImport(const IOS::ES::TMDReader& tmd)
 {
   const u64 title_id = tmd.GetTitleId();
-  const std::string import_content_dir = Common::GetImportTitlePath(title_id) + "/content";
+  const std::string import_content_dir =
+      Common::GetImportTitlePath(title_id, Common::FROM_SESSION_ROOT) + "/content";
 
   // Remove everything not listed in the TMD.
   std::unordered_set<std::string> expected_entries = {"title.tmd"};
@@ -274,7 +277,8 @@ bool ES::WriteImportTMD(const IOS::ES::TMDReader& tmd)
       return false;
   }
 
-  const std::string dest = Common::GetImportTitlePath(tmd.GetTitleId()) + "/content/title.tmd";
+  const std::string dest = Common::GetImportTitlePath(tmd.GetTitleId(), Common::FROM_SESSION_ROOT) +
+                           "/content/title.tmd";
   return File::Rename(tmd_path, dest);
 }
 
@@ -282,7 +286,8 @@ void ES::FinishStaleImport(u64 title_id)
 {
   const auto import_tmd = FindImportTMD(title_id);
   if (!import_tmd.IsValid())
-    File::DeleteDirRecursively(Common::GetImportTitlePath(title_id) + "/content");
+    File::DeleteDirRecursively(Common::GetImportTitlePath(title_id, Common::FROM_SESSION_ROOT) +
+                               "/content");
   else
     FinishImport(import_tmd);
 }
@@ -305,7 +310,7 @@ std::string ES::GetContentPath(const u64 title_id, const IOS::ES::Content& conte
     return content_map.GetFilenameFromSHA1(content.sha1).value_or("");
 
   return Common::GetTitleContentPath(title_id, Common::FROM_SESSION_ROOT) +
-         StringFromFormat("%08x.app", content.id);
+         StringFromFormat("/%08x.app", content.id);
 }
 }  // namespace Device
 }  // namespace HLE
diff --git a/Source/Core/Core/IOS/ES/TitleManagement.cpp b/Source/Core/Core/IOS/ES/TitleManagement.cpp
index 2496f854f7..1bb9a1a752 100644
--- a/Source/Core/Core/IOS/ES/TitleManagement.cpp
+++ b/Source/Core/Core/IOS/ES/TitleManagement.cpp
@@ -342,7 +342,8 @@ static bool CheckIfContentHashMatches(const std::vector<u8>& content, const IOS:
 
 static std::string GetImportContentPath(u64 title_id, u32 content_id)
 {
-  return Common::GetImportTitlePath(title_id) + StringFromFormat("/content/%08x.app", content_id);
+  return Common::GetImportTitlePath(title_id, Common::FROM_SESSION_ROOT) +
+         StringFromFormat("/content/%08x.app", content_id);
 }
 
 ReturnCode ES::ImportContentEnd(Context& context, u32 content_fd)
@@ -604,7 +605,7 @@ ReturnCode ES::DeleteContent(u64 title_id, u32 content_id) const
     return ES_EINVAL;
 
   if (!File::Delete(Common::GetTitleContentPath(title_id, Common::FROM_SESSION_ROOT) +
-                    StringFromFormat("%08x.app", content_id)))
+                    StringFromFormat("/%08x.app", content_id)))
   {
     return FS_ENOENT;
   }
diff --git a/Source/Core/Core/IOS/Network/KD/NetKDRequest.cpp b/Source/Core/Core/IOS/Network/KD/NetKDRequest.cpp
index a36ccf537a..ce3f202ddc 100644
--- a/Source/Core/Core/IOS/Network/KD/NetKDRequest.cpp
+++ b/Source/Core/Core/IOS/Network/KD/NetKDRequest.cpp
@@ -83,7 +83,8 @@ IPCCommandResult NetKDRequest::IOCtl(const IOCtlRequest& request)
     if (config.CreationStage() == NWC24::NWC24Config::NWC24_IDCS_INITIAL)
     {
       const std::string settings_file_path(
-          Common::GetTitleDataPath(Titles::SYSTEM_MENU, Common::FROM_SESSION_ROOT) + WII_SETTING);
+          Common::GetTitleDataPath(Titles::SYSTEM_MENU, Common::FROM_SESSION_ROOT) +
+          "/" WII_SETTING);
       SettingsHandler gen;
       std::string area, model;
       bool got_settings = false;
diff --git a/Source/Core/Core/Movie.cpp b/Source/Core/Core/Movie.cpp
index bf3b0c099f..980e75ee82 100644
--- a/Source/Core/Core/Movie.cpp
+++ b/Source/Core/Core/Movie.cpp
@@ -1384,8 +1384,8 @@ void GetSettings()
   if (SConfig::GetInstance().bWii)
   {
     u64 title_id = SConfig::GetInstance().GetTitleID();
-    s_bClearSave =
-        !File::Exists(Common::GetTitleDataPath(title_id, Common::FROM_SESSION_ROOT) + "banner.bin");
+    s_bClearSave = !File::Exists(Common::GetTitleDataPath(title_id, Common::FROM_SESSION_ROOT) +
+                                 "/banner.bin");
   }
   else
   {
diff --git a/Source/Core/Core/WiiRoot.cpp b/Source/Core/Core/WiiRoot.cpp
index a705801fc1..8058ab2685 100644
--- a/Source/Core/Core/WiiRoot.cpp
+++ b/Source/Core/Core/WiiRoot.cpp
@@ -36,7 +36,7 @@ static void InitializeDeterministicWiiSaves()
     else
     {
       // TODO: Check for the actual save data
-      Movie::SetClearSave(!File::Exists(user_save_path + "banner.bin"));
+      Movie::SetClearSave(!File::Exists(user_save_path + "/banner.bin"));
     }
   }
 
@@ -44,7 +44,7 @@ static void InitializeDeterministicWiiSaves()
       (Movie::IsMovieActive() && !Movie::IsStartingFromClearSave()))
   {
     // Copy the current user's save to the Blank NAND
-    if (File::Exists(user_save_path + "banner.bin"))
+    if (File::Exists(user_save_path + "/banner.bin"))
     {
       File::CopyDir(user_save_path, save_path);
     }
@@ -86,10 +86,10 @@ void ShutdownWiiRoot()
     std::string user_backup_path = File::GetUserPath(D_BACKUP_IDX) +
                                    StringFromFormat("%08x/%08x/", static_cast<u32>(title_id >> 32),
                                                     static_cast<u32>(title_id));
-    if (File::Exists(save_path + "banner.bin") && SConfig::GetInstance().bEnableMemcardSdWriting)
+    if (File::Exists(save_path + "/banner.bin") && SConfig::GetInstance().bEnableMemcardSdWriting)
     {
       // Backup the existing save just in case it's still needed.
-      if (File::Exists(user_save_path + "banner.bin"))
+      if (File::Exists(user_save_path + "/banner.bin"))
       {
         if (File::Exists(user_backup_path))
           File::DeleteDirRecursively(user_backup_path);
diff --git a/Source/Core/DiscIO/WiiSaveBanner.cpp b/Source/Core/DiscIO/WiiSaveBanner.cpp
index a248151e44..444cb0590d 100644
--- a/Source/Core/DiscIO/WiiSaveBanner.cpp
+++ b/Source/Core/DiscIO/WiiSaveBanner.cpp
@@ -25,7 +25,8 @@ constexpr unsigned int ICON_HEIGHT = 48;
 constexpr unsigned int ICON_SIZE = ICON_WIDTH * ICON_HEIGHT * 2;
 
 WiiSaveBanner::WiiSaveBanner(u64 title_id)
-    : WiiSaveBanner(Common::GetTitleDataPath(title_id, Common::FROM_CONFIGURED_ROOT) + "banner.bin")
+    : WiiSaveBanner(Common::GetTitleDataPath(title_id, Common::FROM_CONFIGURED_ROOT) +
+                    "/banner.bin")
 {
 }