Dear Rashmi, Vijay, Abhijeet, ...., Can you please ask this question more precisely? Asking for "guidance" is a bit too vague to expect a helpful answer.

I am doing some data analysis of XANES as well as EXAFS data using data analysis software SIXPack. I am not able to load any data file.

This is confusing. How would you be able to use SIXPack if you are not able to load any data file? Is the program not responding at all? Does it crash when trying to load particular files?? I have no idea. Again, please ask a specific question (for example: why can I not open the attached data file with SIXPack?), and give as much relevant information as you can: what operating system are you using, what you did (File->Open: did a dialog box open??), what SIXPack "does" (any error messages, for example), Can Athena open the file, and so on. We're not there to see what you are (and are not) doing. Please remember that you are sending this request for help to hundreds of people hoping that one of them will be kind enough to volunteer to answer. Being polite is wise, but being clear and to the point is also important. Cheers, --Matt