Today, the NetCF v1 SP3 redistributable has been posted to the Microsoft download center. Once installed, calls to System.Environment.Version.ToString() will return 1.0.4292.0.Exceprts from the download page:
The Microsoft® .NET Compact Framework 1.0 SP3 Redistributable includes everything you need to run .NET Compact Framework applications, including the Common Language Runtime and the .NET Compact Framework class library.---This package uses ActiveSync to update the device. Make sure to dock your device before running NETCFSetup.msi. You can run the ActiveSync setup later by going to your install folder and running NCFSetup.exe once the device is docked. Those not using ActiveSync can run the CAB files which match the device found in the install folder directly on the device.
Supported Operating Systems: Windows 2000, Windows 2000 Server, Windows 2000 Service Pack 2, Windows 2000 Service Pack 3, Windows 2000 Service Pack 4, Windows NT, Windows Server 2003, Windows XP
Happy downloading!-- DKDisclaimer(s):This posting is provided "AS IS" with no warranties, and confers no rights.[Edit: Add version]