The Hach WIMS EDI Analyzer will let you view EDI files based on the file format in SDWIS/State Fixed-Format Lab Data Files.
When you run the program, you will first be asked to select a specific file, click on the elipse button to navigate to the file you want to open and then click on Analyze.
The EDI Analyzer will load the file with the HDR type records on the top half of the display and the DTR records on the bottom half. When you select a specific HDR record, the text of associated DTR records will turn red.