diff --git a/src/common/filesystem/file_7z.cpp b/src/common/filesystem/file_7z.cpp
index 391a8aab2..262dd370d 100644
--- a/src/common/filesystem/file_7z.cpp
+++ b/src/common/filesystem/file_7z.cpp
@@ -227,7 +227,7 @@ bool F7ZFile::Open(LumpFilterInfo *filter, FileSystemMessageFunc Printf)
 		Archive = NULL;
 		if (res == SZ_ERROR_UNSUPPORTED)
 		{
-			Printf(FSMessageLevel::Error, "%s: Decoder does not support this archive\n", FileName.c_str());
+			Printf(FSMessageLevel::Error, "%s: Decoder does not support this archive\n", File_Name);
 		}
 		else if (res == SZ_ERROR_MEM)
 		{
@@ -300,7 +300,7 @@ bool F7ZFile::Open(LumpFilterInfo *filter, FileSystemMessageFunc Printf)
 
 		if (SZ_OK != Archive->Extract(Lumps[0].Position, &temp[0]))
 		{
-			Printf(FSMessageLevel::Error, "%s: unsupported 7z/LZMA file!\n", FileName.c_str());
+			Printf(FSMessageLevel::Error, "%s: unsupported 7z/LZMA file!\n", File_Name);
 			return false;
 		}
 	}
diff --git a/src/common/filesystem/file_directory.cpp b/src/common/filesystem/file_directory.cpp
index a99e6fb56..cbb79b446 100644
--- a/src/common/filesystem/file_directory.cpp
+++ b/src/common/filesystem/file_directory.cpp
@@ -38,6 +38,7 @@
 
 #include "resourcefile.h"
 #include "fs_findfile.h"
+#include "fs_stringpool.h"
 
 std::string FS_FullPath(const char* directory);
 
@@ -91,8 +92,9 @@ public:
 FDirectory::FDirectory(const char * directory, StringPool* sp, bool nosubdirflag)
 	: FResourceFile("", sp), nosubdir(nosubdirflag)
 {
-	FileName = FS_FullPath(directory);
-	if (FileName[FileName.length()-1] != '/') FileName += '/';
+	auto fn = FS_FullPath(directory);
+	if (fn.back() != '/') fn += '/';
+	File_Name = sp->Strdup(fn.c_str());
 }
 
 //==========================================================================
@@ -148,7 +150,7 @@ int FDirectory::AddDirectory(const char *dirpath, LumpFilterInfo* filter, FileSy
 
 bool FDirectory::Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 {
-	NumLumps = AddDirectory(FileName.c_str(), filter, Printf);
+	NumLumps = AddDirectory(File_Name, filter, Printf);
 	PostProcessArchive(&Lumps[0], sizeof(FDirectoryLump), filter);
 	return true;
 }
@@ -167,7 +169,7 @@ void FDirectory::AddEntry(const char *fullpath, int size)
 	lump_p->mFullPath = fullpath;
 
 	// [mxd] Convert name to lowercase
-	std::string name = fullpath + FileName.length();
+	std::string name = fullpath + strlen(File_Name);
 	for (auto& c : name) c = tolower(c);
 
 	// The lump's name is only the part relative to the main directory
diff --git a/src/common/filesystem/file_lump.cpp b/src/common/filesystem/file_lump.cpp
index 540ee6dd7..962482c83 100644
--- a/src/common/filesystem/file_lump.cpp
+++ b/src/common/filesystem/file_lump.cpp
@@ -68,7 +68,7 @@ FLumpFile::FLumpFile(const char *filename, FileReader &file, StringPool* sp)
 bool FLumpFile::Open(LumpFilterInfo*)
 {
 	Lumps.Resize(1);
-	Lumps[0].LumpNameSetup(ExtractBaseName(FileName.c_str(), true).c_str(), stringpool);
+	Lumps[0].LumpNameSetup(ExtractBaseName(File_Name, true).c_str(), stringpool);
 	Lumps[0].Owner = this;
 	Lumps[0].Position = 0;
 	Lumps[0].LumpSize = (int)Reader.GetLength();
diff --git a/src/common/filesystem/file_wad.cpp b/src/common/filesystem/file_wad.cpp
index badcc271f..b79c13cb0 100644
--- a/src/common/filesystem/file_wad.cpp
+++ b/src/common/filesystem/file_wad.cpp
@@ -183,7 +183,7 @@ bool FWadFile::Open(LumpFilterInfo*, FileSystemMessageFunc Printf)
 		// Check again to detect broken wads
 		if (InfoTableOfs + NumLumps*sizeof(wadlump_t) > (unsigned)wadSize)
 		{
-			Printf(FSMessageLevel::Error, "%s: Bad directory offset.\n", FileName.c_str());
+			Printf(FSMessageLevel::Error, "%s: Bad directory offset.\n", File_Name);
 			return false;
 		}
 	}
@@ -220,7 +220,7 @@ bool FWadFile::Open(LumpFilterInfo*, FileSystemMessageFunc Printf)
 		{
 			if (Lumps[i].LumpSize != 0)
 			{
-				Printf(FSMessageLevel::Warning, "%s: Lump %s contains invalid positioning info and will be ignored\n", FileName.c_str(), Lumps[i].getName());
+				Printf(FSMessageLevel::Warning, "%s: Lump %s contains invalid positioning info and will be ignored\n", File_Name, Lumps[i].getName());
 				Lumps[i].clearName();
 			}
 			Lumps[i].LumpSize = Lumps[i].Position = 0;
@@ -305,7 +305,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 	{
 		if (numendmarkers == 0) return;	// no markers found
 
-		Printf(FSMessageLevel::Warning, "%s: %s marker without corresponding %s found.\n", FileName.c_str(), endmarker, startmarker);
+		Printf(FSMessageLevel::Warning, "%s: %s marker without corresponding %s found.\n", File_Name, endmarker, startmarker);
 
 
 		if (flathack)
@@ -319,7 +319,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 				{
 					// We can't add this to the flats namespace but 
 					// it needs to be flagged for the texture manager.
-					Printf(FSMessageLevel::DebugNotify, "%s: Marking %s as potential flat\n", FileName.c_str(), Lumps[ii].getName());
+					Printf(FSMessageLevel::DebugNotify, "%s: Marking %s as potential flat\n", File_Name, Lumps[ii].getName());
 					Lumps[ii].Flags |= LUMPF_MAYBEFLAT;
 				}
 			}
@@ -333,7 +333,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 		int start, end;
 		if (markers[i].markertype != 0)
 		{
-			Printf(FSMessageLevel::Warning, "%s: %s marker without corresponding %s found.\n", FileName.c_str(), endmarker, startmarker);
+			Printf(FSMessageLevel::Warning, "%s: %s marker without corresponding %s found.\n", File_Name, endmarker, startmarker);
 			i++;
 			continue;
 		}
@@ -342,21 +342,21 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 		// skip over subsequent x_START markers
 		while (i < markers.Size() && markers[i].markertype == 0)
 		{
-			Printf(FSMessageLevel::Warning, "%s: duplicate %s marker found.\n", FileName.c_str(), startmarker);
+			Printf(FSMessageLevel::Warning, "%s: duplicate %s marker found.\n", File_Name, startmarker);
 			i++;
 			continue;
 		}
 		// same for x_END markers
 		while (i < markers.Size()-1 && (markers[i].markertype == 1 && markers[i+1].markertype == 1))
 		{
-			Printf(FSMessageLevel::Warning, "%s: duplicate %s marker found.\n", FileName.c_str(), endmarker);
+			Printf(FSMessageLevel::Warning, "%s: duplicate %s marker found.\n", File_Name, endmarker);
 			i++;
 			continue;
 		}
 		// We found a starting marker but no end marker. Ignore this block.
 		if (i >= markers.Size())
 		{
-			Printf(FSMessageLevel::Warning, "%s: %s marker without corresponding %s found.\n", FileName.c_str(), startmarker, endmarker);
+			Printf(FSMessageLevel::Warning, "%s: %s marker without corresponding %s found.\n", File_Name, startmarker, endmarker);
 			end = NumLumps;
 		}
 		else
@@ -365,14 +365,14 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 		}
 
 		// we found a marked block
-		Printf(FSMessageLevel::DebugNotify, "%s: Found %s block at (%d-%d)\n", FileName.c_str(), startmarker, markers[start].index, end);
+		Printf(FSMessageLevel::DebugNotify, "%s: Found %s block at (%d-%d)\n", File_Name, startmarker, markers[start].index, end);
 		for(int j = markers[start].index + 1; j < end; j++)
 		{
 			if (Lumps[j].Namespace != ns_global)
 			{
 				if (!warned)
 				{
-					Printf(FSMessageLevel::Warning, "%s: Overlapping namespaces found (lump %d)\n", FileName.c_str(), j);
+					Printf(FSMessageLevel::Warning, "%s: Overlapping namespaces found (lump %d)\n", File_Name, j);
 				}
 				warned = true;
 			}
@@ -382,7 +382,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 				// ignore sprite lumps smaller than 8 bytes (the smallest possible)
 				// in size -- this was used by some dmadds wads
 				// as an 'empty' graphics resource
-				Printf(FSMessageLevel::DebugWarn, "%s: Skipped empty sprite %s (lump %d)\n", FileName.c_str(), Lumps[j].getName(), j);
+				Printf(FSMessageLevel::DebugWarn, "%s: Skipped empty sprite %s (lump %d)\n", File_Name, Lumps[j].getName(), j);
 			}
 			else
 			{
@@ -452,7 +452,7 @@ void FWadFile::SkinHack (FileSystemMessageFunc Printf)
 	}
 	if (skinned && hasmap)
 	{
-		Printf(FSMessageLevel::Attention, "%s: The maps will not be loaded because it has a skin.\n", FileName.c_str());
+		Printf(FSMessageLevel::Attention, "%s: The maps will not be loaded because it has a skin.\n", File_Name);
 		Printf(FSMessageLevel::Attention, "You should remove the skin from the wad to play these maps.\n");
 	}
 }
diff --git a/src/common/filesystem/file_zip.cpp b/src/common/filesystem/file_zip.cpp
index 175c53e18..c2acb10f7 100644
--- a/src/common/filesystem/file_zip.cpp
+++ b/src/common/filesystem/file_zip.cpp
@@ -180,7 +180,7 @@ bool FZipFile::Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 
 	if (centraldir == 0)
 	{
-		Printf(FSMessageLevel::Error, "%s: ZIP file corrupt!\n", FileName.c_str());
+		Printf(FSMessageLevel::Error, "%s: ZIP file corrupt!\n", File_Name);
 		return false;
 	}
 
@@ -196,7 +196,7 @@ bool FZipFile::Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 		if (info.NumEntries != info.NumEntriesOnAllDisks ||
 			info.FirstDisk != 0 || info.DiskNumber != 0)
 		{
-			Printf(FSMessageLevel::Error, "%s: Multipart Zip files are not supported.\n", FileName.c_str());
+			Printf(FSMessageLevel::Error, "%s: Multipart Zip files are not supported.\n", File_Name);
 			return false;
 		}
 		
@@ -215,7 +215,7 @@ bool FZipFile::Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 		if (info.NumEntries != info.NumEntriesOnAllDisks ||
 			info.FirstDisk != 0 || info.DiskNumber != 0)
 		{
-			Printf(FSMessageLevel::Error, "%s: Multipart Zip files are not supported.\n", FileName.c_str());
+			Printf(FSMessageLevel::Error, "%s: Multipart Zip files are not supported.\n", File_Name);
 			return false;
 		}
 		
@@ -254,7 +254,7 @@ bool FZipFile::Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 		if (dirptr > ((char*)directory) + dirsize)	// This directory entry goes beyond the end of the file.
 		{
 			free(directory);
-			Printf(FSMessageLevel::Error, "%s: Central directory corrupted.", FileName.c_str());
+			Printf(FSMessageLevel::Error, "%s: Central directory corrupted.", File_Name);
 			return false;
 		}
 
@@ -323,7 +323,7 @@ bool FZipFile::Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 		if (dirptr > ((char*)directory) + dirsize)	// This directory entry goes beyond the end of the file.
 		{
 			free(directory);
-			Printf(FSMessageLevel::Error, "%s: Central directory corrupted.", FileName.c_str());
+			Printf(FSMessageLevel::Error, "%s: Central directory corrupted.", File_Name);
 			return false;
 		}
 
@@ -350,7 +350,7 @@ bool FZipFile::Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 			zip_fh->Method != METHOD_IMPLODE &&
 			zip_fh->Method != METHOD_SHRINK)
 		{
-			Printf(FSMessageLevel::Error, "%s: '%s' uses an unsupported compression algorithm (#%d).\n", FileName.c_str(), name.c_str(), zip_fh->Method);
+			Printf(FSMessageLevel::Error, "%s: '%s' uses an unsupported compression algorithm (#%d).\n", File_Name, name.c_str(), zip_fh->Method);
 			skipped++;
 			continue;
 		}
@@ -358,7 +358,7 @@ bool FZipFile::Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 		zip_fh->Flags = LittleShort(zip_fh->Flags);
 		if (zip_fh->Flags & ZF_ENCRYPTED)
 		{
-			Printf(FSMessageLevel::Error, "%s: '%s' is encrypted. Encryption is not supported.\n", FileName.c_str(), name.c_str());
+			Printf(FSMessageLevel::Error, "%s: '%s' is encrypted. Encryption is not supported.\n", File_Name, name.c_str());
 			skipped++;
 			continue;
 		}
@@ -385,7 +385,7 @@ bool FZipFile::Open(LumpFilterInfo* filter, FileSystemMessageFunc Printf)
 					if (zip_64->CompressedSize > 0x7fffffff || zip_64->UncompressedSize > 0x7fffffff)
 					{
 						// The file system is limited to 32 bit file sizes;
-						Printf(FSMessageLevel::Warning, "%s: '%s' is too large.\n", FileName.c_str(), name.c_str());
+						Printf(FSMessageLevel::Warning, "%s: '%s' is too large.\n", File_Name, name.c_str());
 						skipped++;
 						continue;
 					}
diff --git a/src/common/filesystem/filesystem.cpp b/src/common/filesystem/filesystem.cpp
index 6a0049fc8..39a730b7d 100644
--- a/src/common/filesystem/filesystem.cpp
+++ b/src/common/filesystem/filesystem.cpp
@@ -1419,7 +1419,7 @@ const char *FileSystem::GetResourceFileName (int rfnum) const noexcept
 		return NULL;
 	}
 
-	name = Files[rfnum]->FileName.c_str();
+	name = Files[rfnum]->File_Name;
 	slash = strrchr (name, '/');
 	return (slash != nullptr && slash[1] != 0) ? slash+1 : name;
 }
@@ -1485,7 +1485,7 @@ const char *FileSystem::GetResourceFileFullName (int rfnum) const noexcept
 		return nullptr;
 	}
 
-	return Files[rfnum]->FileName.c_str();
+	return Files[rfnum]->File_Name;
 }
 
 
diff --git a/src/common/filesystem/resourcefile.cpp b/src/common/filesystem/resourcefile.cpp
index 5f044371f..0a92fe7da 100644
--- a/src/common/filesystem/resourcefile.cpp
+++ b/src/common/filesystem/resourcefile.cpp
@@ -154,7 +154,7 @@ static bool IsWadInFolder(const FResourceFile* const archive, const char* const
 		return false;
 	}
 
-    const auto dirName = ExtractBaseName(archive->FileName.c_str());
+    const auto dirName = ExtractBaseName(archive->File_Name);
 	const auto fileName = ExtractBaseName(resPath, true);
 	const std::string filePath = dirName + '/' + fileName;
 
@@ -239,7 +239,7 @@ void *FResourceLump::Lock()
 		catch (const FileSystemException& err)
 		{
 			// enrich the message with info about this lump.
-			throw FileSystemException("%s, file '%s': %s", getName(), Owner->FileName.c_str(), err.what());
+			throw FileSystemException("%s, file '%s': %s", getName(), Owner->File_Name, err.what());
 		}
 	}
 	return Cache;
@@ -328,9 +328,9 @@ FResourceFile *FResourceFile::OpenDirectory(const char *filename, LumpFilterInfo
 //==========================================================================
 
 FResourceFile::FResourceFile(const char *filename, StringPool* sp)
-	: FileName(filename)
 {
 	stringpool = sp ? sp : new StringPool;
+	File_Name = stringpool->Strdup(filename);
 }
 
 FResourceFile::FResourceFile(const char *filename, FileReader &r, StringPool* sp)
diff --git a/src/common/filesystem/resourcefile.h b/src/common/filesystem/resourcefile.h
index 6acf0b89b..b73d082c1 100644
--- a/src/common/filesystem/resourcefile.h
+++ b/src/common/filesystem/resourcefile.h
@@ -156,7 +156,7 @@ class FResourceFile
 {
 public:
 	FileReader Reader;
-	std::string FileName;
+	const char* File_Name;
 protected:
 	uint32_t NumLumps;
 	char Hash[48];