File encryption

When I use my work computer my files have to be encrypted (due to previous theft of iimportant files on USB). We currently use an old but effective windows programme called ‘Private file’.

I cannot get this to work under Wine so I was wondering if there is a cross platform programme that will run under linux and windows?

Thanks

For clarity, the original posting with responses can be found here:

http://linuxforums.org.uk/ubuntu/using-an-encryption-programme-in-ubuntu/