[Bug]: Running SQL from files inside Devcontainer does not work

@yoleichen is already working on this.

Since Jul 8, 2026.

### Description

I'm working in a Dev Container but my MSSQL Extension is running on ui so I can login with my IT from the host system (Authentication type: Windows Authentication).

As long as I work with unsaved files I can execute queries. If I run a file stored in the container, it says it executed my query but it doesn't do anything.

Debug Output:
[6:35:40 AM] Started query execution for document "vscode-remote://dev-container+7b227...23a66616c73657d/workspaces/vws-server/scripts/vws/updsql/tmp/t.sql"
[6:35:41 AM] Finished query execution for document "vscode-remote://dev-container+7b227...23a66616c73657d/workspaces/vws-server/scripts/vws/updsql/tmp/t.sql"

Also if I try to save the output as a file, it doesn't know if it should work on the host filesystem or on the container filesystem - so it let's me select a file on the container but then does not write into it...

[7:08:04 AM] Started saving results to /workspaces/vws-server/scripts/vws/updsql/tmp/t.csv
[7:08:05 AM] Failed to save results. Failed to save t.csv: Could not find a part of the path 'C:\workspaces\vws-server\scripts\vws\updsql\tmp\t.csv'.

### Steps to Reproduce

Run VSC with Dev Container and SQL-Server Plugin running on UI.
Execute Query from stored file.
No results are retrieved.

### Affected Area

- [ ] Connection dialog (SQL Server | Azure browse/Fabric browse)
- [x] Query editor
- [x] Query results panel
- [ ] Object Explorer
- [ ] GitHub Copilot integration
- [ ] Preview/Edit data
- [ ] Table Designer
- [ ] Schema Designer
- [ ] Schema Compare
- [ ] Local SQL Server Container provisioning
- [ ] SQL database in Fabric provisioning
- [ ] DACPAC/BACPAC export/import
- [ ] SQL Database projects
- [ ] Query Plan Visualizer
- [ ] Other (please describe below)

### If you selected "Other", please describe the affected area

_No response_

### Environment Information

VS Code Version: 1.107
MS SqlServer Plugin Version: 1.38.0
Host: Win11
Container: ALMA9

### Confirmation

- [x] I have searched existing issues and couldn't find a match
- [ ] I want to work on this issue