DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:\\server\share\sxs Is .NET Framework 3.5 still supported by Microsoft? Yes, as part of Windows 10 and Windows 11, .NET 3.5 is supported as a “feature on demand.” It receives security updates alongside the OS. Will installing .NET 3.5 break modern .NET 6/7/8 apps? No. .NET 3.5, 4.x, and modern (.NET 5+) run side-by-side without conflict. They are different runtime environments. Do I need this CAB for Windows 11? Yes. Windows 11 does not include .NET 3.5 by default. Legacy apps will fail to launch until you enable it. Can I uninstall .NET 3.5 later? Yes. Use the same DISM command but with /Remove-Package or uncheck the feature in Control Panel. Conclusion: Keep This CAB in Your Toolbox The microsoft-windows-netfx3-on-demand-package.cab is a tiny powerhouse of compatibility. By keeping a copy on a USB drive or network share, you ensure that old accounting software, engineering tools, and classic games will always run —even without internet.
Grab the CAB from a Windows ISO, run the single DISM command above, and move on with your day. Further reading: Microsoft Official Docs: Install .NET Framework 3.5 on Windows 11/10 microsoftwindowsnetfx3ondemandpackagecab extra free
For IT pros managing fleets of computers, having a local copy of the microsoft-windows-netfx3-on-demand-package.cab can save hours of bandwidth and troubleshooting. Advanced: Slipstream .NET 3.5 into Your Windows Installation Image If you often reinstall Windows, you can permanently add .NET 3.5 to your install.wim file using the same CAB: Do I need this CAB for Windows 11
| Situation | Windows Update | CAB File Approach | |-----------|----------------|-------------------| | | ❌ Fails | ✅ Works | | Slow internet | ✅ Download once | ✅ Use once, copy forever | | Multiple PCs | ❌ Each PC downloads | ✅ Copy to USB, install on 100+ PCs | | Air-gapped networks | ❌ Impossible | ✅ Perfect | | SCCM / MDT deployment | ❌ Requires internet | ✅ Integrate into image | .NET Framework 3.5 offline installer
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