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The only resource I found are in the answer here, which is very complete but doesn't cover everything. So:

  • What is ExportHelper? How does adding it to a class declaration modify the execute method in order to call the file dialog?
  • Why is there no documentation about it on doc.blender.org
  • What are all the variables related to it (filename_ext, filter_glob, use_setting, and that's all?)
  • Where may I found some info about it?

(Additional : answer mentioned above indicates to look at Templates > Python > Operator File Export, which "Templates" is this reffering to?)

sayanel
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    https://github.com/sobotka/blender/blob/b964f73e7dc435b8b455b4ffbef7132aaeef1e0d/release/scripts/modules/bpy_extras/io_utils.py#L55 – scurest Jun 23 '21 at 14:25
  • I'm not so good at python to understand all of it, but I see no option besides check_existing? – sayanel Jun 23 '21 at 14:32
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    I finally found a bit of help here https://sinestesia.co/blog/tutorials/using-blenders-filebrowser-with-python/ (explaining for example the use of properties). Had to search importHelper instead of export helper – sayanel Jul 20 '21 at 09:51

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