If you are looking for the decompiler itself, visit https://github.com/jindrapetrik/jpexs-decompiler
NEW : We have got a new blog where we post some interesting SWF internals info.
List of issues#1544 invalid swf file, wrong signature.
Author: 
wtfiwinomgs
wtfiwinomgsDate created:
Type: bug
Visibility: Everybody
Assigned to:
State: invalid 
> 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.
ev01B.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.
*encrypted
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