Check out some options how swf files might be converted to sb3 format.
It is not possible to recover Scratch projects (.sb3) back from previously exported SWF Flash content, which is what users searching for swf to sb3 conversion are interested in. It is actually difficult to even export .sb3 files to SWF format nowadays, and is only doable with previous version (.sb2 files) anyway.
Unfortunately, there is no detailed software record in the database for this conversion.
This conversion entry was verified by us and conversion from swf to sb3 was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it can't be done because incompatibility between programs, caused by closed file formats, very limited support or by other problems.
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Additional links: Open swf file, Open sb3 file
SWF
Files with sw extension can be commonly found as Shockwave Flash movies in animated vector format, used mainly on Internet web sites.
Files with swf file suffix are related to the Microsoft Sidewinder profile activator data format.
SB3
Files with sb3 extension can be pretty much always found as projects from the Scratch 3.0 development tool.
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