Hi @Brett Green ,
Open SSDT, go to Tools--Extensions and updates, check that Integration Services Project is installed and enabled.
To install Integration Services project support in ssdt2017, you may need to run the SSDT standalone installer.
To run a DTSX file, double click will not open it with SSDT, you may need to create a new integration service project in SSDT and then add existing package.
Regards,
Zoe
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