Process Watcher displays garbled text when using external PostgreSQL binaries on Windows

[abboy-ringo]

Describe the bug

When running Backup/Restore or other maintenance operations on Windows, the Process Watcher shows garbled text in stdout/stderr when pgAdmin is configured to use external PostgreSQL binaries instead of the bundled runtime binaries.

Japanese encoding is CP932.

To Reproduce

OS: Windows 11 Pro (Japanese)

1. Open File → Preferences → Paths → Binary Paths
2. Set PostgreSQL Binary Path to an external PostgreSQL installation (e.g., C:\Program Files\PostgreSQL\16\bin)
3. Run a Backup or Restore operation
4. Open the Process Watcher
5. Text in stdout/stderr appears as garbled text

Screenshots

Desktop (please complete the following information):

• OS: [Windows 11 Pro (Japanese)]
• pgAdmin version: [pgAdmin4 9.8]
• Mode: [Desktop]
• Package type: [Installer]

Additional details

• Article in Japanese: https://qiita.com/ab-boy_ringo/items/e0cee8708700664973ea