diff --git a/public/filesystem.h b/public/filesystem.h
index 9b106051..8e40b332 100644
--- a/public/filesystem.h
+++ b/public/filesystem.h
@@ -361,7 +361,7 @@ public:
 
 // This is the minimal interface that can be implemented to provide access to
 // a named set of files.
-#define BASEFILESYSTEM_INTERFACE_VERSION		"VBaseFileSystem011"
+#define BASEFILESYSTEM_INTERFACE_VERSION		"VBaseFileSystem012"
 
 abstract_class IBaseFileSystem
 {
@@ -512,6 +512,8 @@ public:
 		FileFindHandle_t *pHandle
 		) = 0;
 
+	virtual void			FindFileAbsoluteList( CUtlVector<CUtlString> &, const char *, const char * ) = 0;
+
 	//--------------------------------------------------------
 	// File name and directory operations
 	//--------------------------------------------------------
diff --git a/public/filesystem_passthru.h b/public/filesystem_passthru.h
index 450d2bbf..53a0c124 100644
--- a/public/filesystem_passthru.h
+++ b/public/filesystem_passthru.h
@@ -236,6 +236,7 @@ public:
 	virtual FSDirtyDiskReportFunc_t	GetDirtyDiskReportFunc() { return m_pFileSystemPassThru->GetDirtyDiskReportFunc(); }
 	virtual int	AddVPKFile( const char *file, SearchPathAdd_t path ) { return m_pFileSystemPassThru->AddVPKFile(file, path); }
 	virtual bool IsLocalizedPath ( const char *path ) { return m_pFileSystemPassThru->IsLocalizedPath(path); }
+	virtual void FindFileAbsoluteList( CUtlVector<CUtlString> &a, const char *b, const char *c ) { m_pFileSystemPassThru->FindFileAbsoluteList(a, b, c); }
 protected:
 	IFileSystem *m_pFileSystemPassThru;
 };