JPEXS Free Flash Decompiler Issue Tracker

If you are looking for the decompiler itself, visit

: The issue tracker is now writable again and logged users can download files too. But note that our support is very LIMITED.

List of issuesList of issues

#1544 invalid swf file, wrong signature.
Date created:
Type: bug
Visibility: Everybody
Assigned to:
State: invalid Help

> What steps will reproduce the problem? using JPEXS to open attached .swf file, gets error invalid swf file, wrong signature. > What is the expected output? What do you see instead? should open up .swf no problem > What version of the product are you using? Is it "nightly build"? Which operating system do you have? V10.0.0 > Please provide any additional information below. If the problem is related to a SWF file, attach it here, otherwise we can't help you. swf file is attached.
Downloadev01B.swf (2,653 KiB)
This is not an SWF file, just a file with swf extension... Probably an anvcrypted data. A content of an SWF file should start with FWS, CWS or ZWS bytes. Check issue #893.
i thought JPEXS is a decompiler and should open up these type of .swf just fine even if its encrypted?
FFDec can process only valid SWF files - those which can be played in Flash player. This file has .swf extension but this is not enough - also file structure must be compliant with SWF standard - This file is not, it looks like random data. If you are 100% sure there is something SWF related inside, then it probably needs some kind of decryption/unpacking routine first. Go where you got this file and search for an unpacking routine, maybe you find something. FFDec cannot help you with this since decryption routine can be literally anything. FFDec can only help you in cases of obfuscated ActionScript - some tools call that encryption too, but the file still must have valid SWF structure - this file does not have it.
State: new→invalid