We have submitted an IDML file to our Worldserver and although the file has been created in Adobe InDesign CC - which is officially supported - the file cannot be segmented because of the an error pointing to unsupported version as described in this article:

Error message when segmenting an IDML or a MIF file in WorldServer: 'The selected IDML/MIF file was created by an unsupported version of Adobe InDesign/FrameMaker'

The article explains the workaround to avoid the error. However, I wonder why can the IDML file not be segmented since it has been created in a supported version of Adobe InDesign.

While WorldServer officially supports IDML files created in Adobe InDesign versions CS4 to CC (Creative Cloud), sometimes you might encounter an error related to an unsupported version during segmentation. This happens because Adobe regularly releases updates to its Creative Cloud Suite. If an updated version has been released after the release of your WorldServer version, that IDML CC file could still not be supported.

- In WorldServer 10.4.5., the latest Adobe CC (Creative Cloud) supported version is version InDesign CC 2017.1 (12.1): 14 April 2017. 

- In WorldServer 11.3.x and 11.4.x, the latest Adobe CC (Creative Cloud) supported version is version InDesign CC 2018.2 (13.2), released in March 2018. Of course, all earlier versions are supported as well.

- In WorldServer 11.5 Adobe CC (Creative Cloud) versions 14.x and all the successive 14.x minor versions are supported. Of course, all earlier versions are supported as well.

- In WorldServer 11.6.1 these Adobe CC (Creative Cloud) versions 15.0 (CC 2020) to 16.0 (CC 2021) and all the successive 15.x and 16.x minor versions are supported. Of course, all earlier versions are supported as well.

- In WorldServer 11.7.3 the Adobe CC (Creative Cloud) 2021 (17.0), released in October 2021 and all the successive 17.x minor versions are supported. Of course, all earlier versions are supported as well.

- In WorldServer 11.8.1 and 11.8.2, the Adobe CC (Creative Cloud) version 18.0, released in October 2022 and all the successive 18.x minor versions are supported. Of course, all earlier versions are supported as well.

Currently (June 2024), IDML files created in Adobe InDesign CC version 19.0. to 19.4 are not supported in WorldServer's latest version 11.8.2. They are also not supported in Trados Studio 2022 SR2 (17.2.10.19084). If you want to process such a file, change the file type configuration to process unsupported versions.

Note: This information has been validated by RWS Support. However, we have found that in some cases, files in higher versions are processed correctly. It might be related to the content of the single files. Please test your IDML file in WorldServer and if you find one of the errors that can be fixed by changing the InDesign version or by adapting the Adobe InDesign CS4-CC IDML File Type configuration, try to apply the workarounds provided in the respective articles below:

WorldServer - Error message when segmenting an IDML file: 'The selected IDML file is invalid because required files are missing in IDML package. Probably the file is corrupted'
WorldServer - Error message when segmenting an IDML or a MIF file: 'The selected IDML/MIF file was created by an unsupported version of Adobe InDesign/FrameMaker'
 

These articles are relevant:

How to determine in which version your InDesign IDML file has been created
WorldServer - Error message when segmenting an IDML file: 'The selected IDML file is invalid because required files are missing in IDML package. Probably file is corrupted'
WorldServer - Error message when segmenting an IDML or a MIF file: 'The selected IDML/MIF file was created by an unsupported version of Adobe InDesign/FrameMaker'