Recently I seen a %20 use in a file name e.g. My%20Documents. I was
wondering what does the %20 mean, and are there any other % variable
that would be helpful to know?

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Request for Question Clarification by webadept-ga on 24 Jan 2005 12:19 PST

Hi, 

The %20 is not a variable name, rather it is a ascii code representing
a blank space inside a file name. You will see the same representation
on website urls, where the file names have spaces in them as well.

Since this is probably a huge let down for you (was for me when I
first saw them).. I posted this in the clarification area, instead of
answering the question, and taking the bid.

Sorry about that, keep on keeping on as they say. :-)

webadept-ga

You will probably come across a few from this list:

%20 is a space,
%0A is a line feed,
%0D is a carriage return,
%3A is a : (colon)
%3B is a ; (semi-colon)
%2F is a / (forward slash)
%5C is a \ (backslash)
%21 is a ! (exclamation)
%22 is a " (inverted comma)
%23 is a # (hash)
%3F is a ? (question mark)
%3D is a = (equals)
%40 is a @ (at)
%25 is a % (percentage)
%3E is a > (greater than)
%3C is a < (less than)
%24 is a $ (dollar)
%26 is a & (ampersand)
%5B is a [
%5D is a ] 
%7E is a ~ (tilde)
%5E is a ^
%60 is a ` 
%7B is a { (opening bracket)
%7D is a } (closing bracket)
%7C is a | (pipe)

Source: http://www.dwfaq.com/Tutorials/Miscellaneous/special_links_encoding.asp

just to add to the above comment, its of format %##
where ## is a hex number, so 20 is actually ascii 32, which is a space and so on.

Have Fun!
Pratap