Index: src/libchcore/IFilesystemFile.h
===================================================================
diff -u -ra4635addad389b9e117679437a3e1b64a739ea96 -r38031c379667959206abe69507d8a4e3b040dba6
--- src/libchcore/IFilesystemFile.h	(.../IFilesystemFile.h)	(revision a4635addad389b9e117679437a3e1b64a739ea96)
+++ src/libchcore/IFilesystemFile.h	(.../IFilesystemFile.h)	(revision 38031c379667959206abe69507d8a4e3b040dba6)
@@ -49,6 +49,8 @@
 		virtual void WriteFile(TOverlappedDataBuffer& rBuffer) = 0;
 		virtual void FinalizeFile(TOverlappedDataBuffer& rBuffer) = 0;
 
+		virtual void CancelIo() = 0;
+
 		virtual void Close() = 0;
 
 		virtual bool IsOpen() const = 0;