**Steps to Reproduce** Install Sysinternals Suite from the Microsoft Store Package example: Microsoft.SysinternalsSuite_2025.11.3.0_x64__8wekyb3d8bbwe Create or locate an existing .rdg file Double-click the .rdg file Or attempt to assign a default app via Settings ? Apps ? Default apps ? Choose default by file type **Expected Behavior** .rdg files should be associated with Remote Desktop Connection Manager Double-clicking an .rdg file should open it in RDCMan RDCMan should appear as a selectable default apps for .rdg **Actual Behavior** .rdg files have no association RDCMan does not appear as an available app for .rdg There is no supported way for administrators to force the association post-install **Notes** This appears to be due to the MSIX manifest not declaring a fileTypeAssociation for .rdg for the RDCMan app entry point. Because this is an MSIX/Store app: Traditional EXE-based associations are not possible Registry-based workarounds are blocked by design DefaultAppAssociations XML only works for new user profiles and is not a complete solution The portable ZIP version of RDCMan does not have this limitation **Request** Please add a .rdg file type association to the RDCMan AppX manifest in the Sysinternals Suite Store package so .rdg files can be opened normally.