Preserve the CWD when showing the file open/save dialog.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/Utils@23925 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac
Update issue #464
Add helper method to convert ANSI to UTF8.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/Utils@23991 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac