Without exception, always create your robots file in a plain text editor (i.e., Notepad). It will not work if it is created in Word, or has any extension other than .txt(i.e., files ending in .doc, .htm, .html, etc. will not work).
All search engines will look for the same robots text file by the same name and with the same extension.
robots (required file name) + txt. (required file extension)
When created, your file name should look like this ("robots" is plural and all lower case):
robot.txt
When uploaded to your website, it should be placed ONLY in the root directory as follows:
http://yourdomainname.com/robots.txt

