Search For Special Characters

Anyone know of a search engine that will search for special characters?
e.g. I want to search for the meaning of %%~dpi in a batch file

Google/Windows Live and AllTheWeb seem to just ignor the percent signs
http://groups.google.com/group/Googl...61e1942b1c62e#

it's not quite that simple. They convert percent signs to other symbols. Try replacing % with %25 because this is how a web browser will represent a percent symbol. Otherwise it thinks it is ascii notation.