Microsoft Net Framework 1.1 Service Pack 1 64-bit Download ~upd~ -
.NET Framework 1.1
There is no native 64-bit version of . All applications built with version 1.1 are treated as 32-bit and must run on 64-bit systems via the WOW64 (Windows-on-Windows 64-bit) emulation layer.
Microsoft Update Catalog
If one navigates to the official ( catalog.update.microsoft.com ), they can still find the 64-bit service pack, but it is buried. The specific package is typically named: NDP1.1sp1-KB867460-X64.exe microsoft net framework 1.1 service pack 1 64-bit download
Note on Terminology & Availability:
Microsoft never released a native 64-bit version of .NET Framework 1.1. Version 1.1 was designed exclusively for 32-bit (x86) systems. While it can run on 64-bit Windows via the WOW64 (Windows 32-bit on Windows 64-bit) compatibility layer, there is no standalone "64-bit" installer. The following post explains how to handle this correctly. Download the standard 32-bit dotnetfx
Which files you need
Understanding Microsoft .NET Framework 1.1 SP1: The 32-bit Component on 64-bit Systems
Enable .NET 3.5
: Most legacy apps designed for 1.1 or 2.0 can run using .NET Framework 3.5 , which is included in Windows 10/11. Open Control Panel > Programs and Features . Select Turn Windows features on or off . Full Bootstrapper Package (Includes
- Download the standard 32-bit
dotnetfx.exe+NDP1.1sp1-KB867460-X86.exe. - Install on 64-bit Windows using WOW64 (automatic).
- Apply compatibility tweaks if needed.