JPEXS Free Flash Decompiler Issue Tracker

If you are looking for the decompiler itself, visit

+ update 2020: WARNING - support of the decompiler is now VERY LIMITED. There are no active developers. This means we will NOT develop new features and/or fix most of bugs. We left the tracker running in case somebody from community would like to work on it. Sorry for the inconvenience.

List of issuesList of issues

#1357 SWC not loadable
Author: user cacaod
Date created:
Type: bug
Visibility: Everybody
Assigned to:
State: upgraded Help

> What steps will reproduce the problem? Load the attached SWC into FFDEC. > What is the expected output? What do you see instead? SWC fails to load with error. > What version of the product are you using? Is it "nightly build"? Which operating system do you have? v10.0.0, not a nightly build. OS; macOS 10.12.3 > Please provide any additional information below. If the problem is related to a SWF file, attach it here, otherwise we can't help you. Desprite the SWC not loading, it can successfully load the "library.swf" file if extracted, but the file can't be repacked. Ideally the SWC will be able to be edited and saved. I just need to change one P-Code instruction.
developer ption-only-deflated-entries-ca Your SWC file has been compressed in an unusual way. Rename it to zip, decompress, and compress it again. Rename it back to SWC.
State: new→upgraded
Do you have any tips on what compression or archiver to use? I've tried using multiple archivers and also setting the compression to "store", but every single SWC I create is not accepted by the compiler. What compression settings will make a working SWC?
UPDATE: I've figured it out, thanks for the advice. I used zipinfo and the archivers were adding a subfolder. It's working now.
Ok:) just tried Far manager, Total Commander and the built-in Windows compressor, all of them produces a working SWC