I would add to this conversation (for the sake of searchability) that the reported error in Visual Studio--"Error deleting the file 'filename.ext'. The system call level is not correct."--can also be accompanied by a complementary error in Windows Explorer when trying to delete the same file ("The action can't be completed because the file is open in another program. Close the file and try again.") Or when trying to copy or move another file over to replace that same file, you might get, "An unexpected error is keeping you from copying the file. If you continue to receive this error, you can use the error code to search for help with this problem. Error 0x800704C8: The requested operation cannot be performed on a file with a user-mapped section open."