I don´t know how you can do it...

Have you tried IgorPro and its import tool? It supports .chi and many other formats. Information here:

https://github.com/Yohko/importtool

http://www.wavemetrics.com/products/igorpro/dataaccess.htm

Thanks Paul ..I shall check it out

I install Powdll for converting UXD to RAW but the software is not working showing "object reference not set to an instance of an object" is there any other software to convert UXD file to raw

You can also try this link: https://www.online-convert.com/

Following

I have found this page, looks pretty useful:

http://www.ccp14.ac.uk/solution/powderdataconv/

and this free software: http://powdll-converter.software.informer.com/2.2/

Following