--- chm2pdf	2011-11-20 17:46:26.000000000 +0100
+++ chm2pdf_links_case_insensitive	2011-11-20 19:40:07.000000000 +0100
@@ -460,9 +460,11 @@
             pf.close()
     
             # Substitutions in 1st pass: we replace the original filenames with their corresponding "garbled" equivalents.
+            # added (?i) modifier to make a case insensitive match for not breaking working links on windows in CHM files
+            # added " to the match criteria to avoid wrong match (eg this.htm matched also do_this.htm before)
             for match_string in  match_strings:
-                replace_string = replace_garbled_strings[match_strings.index(match_string)]
-                page = re.sub(match_string, replace_string, page)
+                replace_string = replace_garbled_strings[match_trings.index(match_string)]
+                page = re.sub('(?i)"'+match_string, '"'+replace_string, page)
             
     
             # Substitutuions in the 2nd pass: we replace the garbled filenames with the correct ones.