Hi Forum,
I need to save V2025 .skp Files as an older .skp Files (V2023). How is that possible?
Thanks in advance, Greetings Peter
SU V2023 (actually from SU V2021) can open files saved in later version.
By the way, saving to V2023 is only possible in SU 2023, saving to V2024 is only possible in SU 2024, and so on…
The Ruby API still allows saving to V2021 and to earlier, so it is possible to use e.g. this extension for saving to older versions.
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As @dezmo pointed out, as of 2021 SketchUp uses an “open-ended” file format, which means that new releases can add features without altering existing ones. When an older version (2021 or newer. Pre-2021 versions don’t support the new format) opens a newer version’s file, SketchUp loads the features that existed at that time and ignores anything newer. So, the file will load, but may be missing some things. That will affect the contents only if you happened to use newer features in your 2025 model and they are essential to the completeness of your model after loading in 2023. Much of the time, there will be no effect.
As he also noted, the Ruby API still contains the ability to save to older versions and there are extensions to do so. But that just means that any new features will be omitted in the saved 2023 version file rather than present but ignored when 2023 loads the file.
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Some additions:
When you open a file with a newer (or older) version of SU, a so-called File Version Warning window pops up - which many people think is a warning about a “broken” file - but it only briefly warns you of what we explained here. 
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Understood! Thanks a lot guys!
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