My application doesn't like the "/start-end" sequence suffix in files saved by Jalview

Looking for the 'Launch Jalview' buttons ?

You need to download an installer to run Jalview 2.11.
You can still use webstart to access old versions of Jalview in the version archive

In the application, open the preferences dialog window (Tools -> Preferences) Open the tab labelled "Output" and then select which file formats to which you do not wish to append "/start-end"

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