Editing Scaleform GFx files

I know it’s possible to extract these files from the game with OpenIV, modify headers and extension and then decompile them with various software like Sothink SWF Decompiler or JPEXS Free Flash Decompiler to get editable ActionScript files.

But how to compile them back into swf after making changes? I know it’s possible, because people sometimes release resources with custom, modified gfx that override the originals.

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Adobe Flash was the original SWF creator. I believe Sothink Quick SWF can also create and edit SWF files.
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I don’t want to make new swf files from scratch. I want to modify the existing parts of GTA V interface.

They Edit also.