Viewer? Like for shipsets, or for mods? There's a shipset viewer in the SE5\Utilities folder, and as for mods, I think an editor would be much more useful...
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The Ed draws near! What dost thou deaux?
David G made an SEIV Viewer that I used just to look up weapon and Facilities information. To find out what I needed to research to get to certain fields. I'm not a game Modder. Just wandered if there was one out or under construction.