Solve : How to rename multiple files of different name and same extens

1.	Solve : How to rename multiple files of different name and same extension to diff names?
Answer» I have a number of file with same name and DIFFERENT extension in a folder, Originally these files were all in .Jpg format with different NAMES. like 1.j87 1.j88 1.j89 Now I've to rename each image to different name and extension individually. How can I rename the files to different names and to .jpg format at once as the number of files is more than 100. [attachment deleted by admin to conserve SPACE]I've USED this utility in the past; http://www.bulkrenameutility.co.uk/Download.php it's very customisable but have not needed to use it to bulk change the file extensions.

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