RDCMan file association for .rdg is not declared in the Store/MSIX manifest

[ch1phead]

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.