I just thought I might add, even with the latest innounp the current release of uni extract will fail on certain versions of Inno (ex. v5.1.5). This has nothing to do with innounp itself, which can upack the files fine, but with peid's definition files. I attempted to add custom OEP sigs for newer versions but for some reason peid won't pick them up while in use by peid. I don't know what you've done in new unreleased version but if I remember correctly finding an alternative to using peid was on your todo list. If not, maybe a modded version of peid is in order that will pick up the custom def files (I could be doing something wrong as well) as well as not overwrite settings in registry. I have two copies of peid, one with a batch of plugins and such and then one being used by uni extract. I think I posted a modded version of peid to prevent it from writing to registry its own settings so as to not mess up my standalone version. edit: Thought I would add an example. Scanning this installer with peid stock def files you get "Borland Delphi 2.0 [Overlay]" but if I do an "External scan" it picks up the definitions I made and correctly identifies it as "Inno Setup Module v5 [Overlay] *". So when uni extract scans this file it sees it as a delphi file and rejects it. http://www.gertrudisgraphics.com/GertFullSetup1_0_0_0636.EXE