o changelog of previous commit (oops, sorry):
- added support for Excel, Powerpoint, HTML
- file extension matching is case insensitive
o corrected inline changelog
# - make extension matching case insensitive
#
# 2003-03-23
# - make extension matching case insensitive
#
# 2003-03-23
-# - Support for MS Excel (xlhtml)
+# - Support for MS Excel (xlhtml) and Powerpoint (ppthtml)
#
# 2004-03-09
# - Support for HTML (html2text)
#
# 2004-03-09
# - Support for HTML (html2text)