Then you can install DLT-Logs like any other extension for Visual Studio Code, e.g. via command "Extensions: Install Extensions" and then enter DLT-Logs and click "Install".
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After installation you can open DLT files via
Opening multiple files
You can open multiple DLT files one after the other and they will appear in different views.
If you want to open multiple DLT files into the same view you can simply select multiple files in the "Open DLT file..." dialog. They will be sorted by the first valid DLT message recorded time and then opened.