Hi, Was impressed by the Worflow screencasts but when I converted my history to a workflow it failed. This is because some of the tools output tabular data, but some downstream tools require interval format input and therefore fail. When I made the history I manually changed the file format and nominated the fields for chr,start,end,strand, but this is lost in the workflow. Obvious ideas: * Use a tabular-to-interval tool - I looked but can't find one * Only used tools which output interval format - a less desirable solution. e.g. I can't figure out how to filter out duplicate codons in my gene-BED-to-codon-BED file except using the statistics->count function which outputs tabular. Has anyone worked out how to change formats within a workflow? regards, Paul