reedk writes "I was having a discussion with my boss about long-term archives, and we got on the topic of older files becoming un-readable by newer versions of software. Not only are those old Ami pro files unreadable by today's common word processors, but I have heard that newer version of Office can't consistently open very old versions of Office documents. With the increasing retention periods being forced by current and coming regulations, this could become a problem of compliance in the future. We want to pursue this topic, but to build support for it internally, I am looking for examples of older file formats that are no longer readable by newer version of the same software or due to the market death of the product. If true, this would lend a lot of force behind moving to products that have an open file format. Can Slashdot readers come up with examples of this, or ways they have had to get around these kinds of problems?"