sb3 files are from Scratch and you can easily just upload the .sb3 projects to it. Some people are looking for a way to get modern project for older version of Scratch, for example .sb2 files so they can export these to now discontinued Flash. But this is not doable with Scratch itself and you have to rely on some 3rd party solutions for that.
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Conversion of sb3 file format to scratch file format beta
Search for sb3 to scratch converter or software able to handle these file types.
Convert Scratch 3.0 project file to Scratch project.
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: sb3 file extension details, scratch file extension details
SB3
Files with sb3 extension can be pretty much always found as projects from the Scratch 3.0 development tool.
SCRATCH
Scratch files are projects from Scratch block-based visual programming language and education tool for programming.
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