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+# FFDec Frequently asked questions (FAQ)
+
+## "Invalid SWF file, wrong signature" on opening file with .swf extension, what's that?
+This message means that you are opening file which is not really the SWF. FFDec can process only valid SWF files - those which can be played in Flash player. SWF file extension is not enough - also file structure must be compliant
+with SWF standard - it needs to start with FWS, CWS or ZWS bytes. If you are 100% sure there is something SWF related inside your file, then it probably needs some kind of
+decryption/unpacking routine first. Go where you got the file and search for an unpacking routine (loader), maybe you find something. FFDec cannot help you with this since decryption
+routine can be literally anything.
+
+## Can I add new scripts? Or classes?
+No, this feature is not implemented, sorry. Editing is limited to existing scripts or classes.
+
+## Direct editation of ActionScript gives me an error, what can I do?
+Direct editation of AS is experimental and in most cases not even working - it might damage your SWF file. We won't fix that, sorry.
+
+## Can you implement new feature for me?
+No, we no longer work on the decompiler. But decompiler is opensource, you can implement feature yourself.
+
+## But there are bugs, you will surely fix that
+No, sorry, we no longer fix any bugs. Ask somebody else.
+
+## Is there a documentation for FFDec library?
+No, there is'nt one.
+
+## What's that thing with § character in scripts?
+A) Variable identifiers which have invalid characters in their name are displayed in the form `§name§` (for example `§s-r/rg§` ).
+This allows easier direct editation.
+
+B) Also, there exist few special instructions/functions with prefix §§:
+- `§§push(item)`
+- `§§pop()`
+- `§§dup()`
+- `§§goto(label)`
+
+These functions usually pop out when you try to decompile some obfuscated / unstructured code.