I need you to write a script for BrownRecluse website Extractor.
BrownRecluse extractor understand a special language similar to pascal or vbscript.
Import a list of URLs from a file;
Spider each site, recording the URLs of every page with a .doc, .pdf or .xls extension;
Save the list of URLs to a suitable format, such as Excel, for later analysis.
The sites involved will be large - 100k pages, so the script needs to be efficient.