SAS 9.2 began doing the same thing to me after I installed an additional SAS product & inadvertently checked the Universal Viewer box. What I found was, if I right-clicked on the file, I would get a menu showing several SAS options including the option to open the file in SAS v9.2 for Windows. This worked for *.sas files and *.sas7bdat files. Whether it will work for *.xpt files, I cannot say.
One of my colleagues recently installed SAS 9.3. When he clicked on his old *.sas files, a window would open up and immediately close again like I've seen SAS do when opening files in batch mode. And right-clicking on the *.sas file didn't give a list of options. He did contact SAS technical support, and they helped him through it, and by the next day, SAS was working for him the way it should.
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Eric Siegel
Biostatistician
Univ of Arkansas for Medical Sciences
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