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- Regarding code signing, which will probably become more and more frequent as new Leopard apps ship, the situation differs between signed executable files (i.e., files containing code or libraries) and signed resources (i.e., images or data files). Signed *resources* cannot be modified or deleted, so we added a check, starting in Xslimmer 1.2.8, that automatically excludes them from the list of suitable files to be slimmed down. Signing code files, on the other hand, affects each architecture independently, as described in http://developer.apple.com/documentation/Security/Conceptual/CodeSigningGuide/Procedures/chapter_3_section_4.html. That document specifically states that “Because each architecture component is signed independently, it is all right to perform universal-binary operations (such as running the lipo command) on signed programs. The result will still be validly signed as long as you make no other changes.”. It’s also worthwhile mentioning that even if an application is signed, usually only a subset of the resources contained in the bundle are actually signed. This means that the opportunity for size reduction is still present, even if to a lesser extent.

- Your comment on Adobe’s Creative Suite is also correct. The applications work perfectly fine after being slimmed down, but the update procedure fails due to the integrity checks the apps perform. In this case, we had no choice but to add the apps to the blacklist, so they will not be modified in any way when running Xslimmer. This blacklist containing apps known not to work properly is dynamically downloaded by Xslimmer, and all entries are added by us after careful evaluation of reports from our customers. I believe this mechanism, combined with the built-in backup procedure or the check for signed resources, provides a reasonable safety net for our customers.

@Kristian – Thanks a lot! Our business relies on user satisfaction and word of mouth, and we are proud you like our software as much as to recommend it :)

Many thanks for your nice comments, we’ve put a lot of effort into the app and it’s incredibly rewarding to receive positive feedback from our customers :)

I love this app and I can highly recomend it to other mac users.

If you have a small hard drive, then apps like Xslimmer are quite useful for regaining as much HD space as possible. In fact, I use Delocalizer on my iBook G4 (20GB drive). Just wanted to add a few friendly warnings.

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