mayuradatia

1) I want to encrypt all my .doc files before saving and decrypt before opening so that they open fine in Word. Should I be writing a file system filter driver for such a task? Is there any other way, I can do this? 2) Can I use WDK to build such a file system filter driver? 3) Do I need to use IFS kit for writing a file system filter driver? 4) Will one filter driver work across various file systems supported by Windows XP & Vista? 5) Will a new file system filter driver work fine on the machine having anti-virus software installed.