When importing .txt file into DewesoftX the .txt file is being read into the memory. The maximum amount of data that can be read in to the memory is defined by the maximum number of strings that can be read and is 134,217,728. There are no limits on the size of the string (other than physical memory limits and processor address space limits). Depending on the number of channels and amount of data in the .txt file the maximum string limit is achieved when the .txt file is approximately 1 GB in size.