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I presume you are talking about the *.sav file format? There are several versions of PSSE34, and the files might not be backwards compatible. For example. if you have v34.2 installed, and someone gives you a sav file that was created using v34.4, then you might not be able to open it. I would advise you to "go back to the source" and find out what version of PSSE was used to create the sav file that you cannot open.