KomuraSoft LLC Blog
Windows / C# / COM engineering notes from KomuraSoft LLC.
https://comcomponent.com/en/feed.xml
2026-09-14T00:00:00+00:00
© 2026 KomuraSoft LLC
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小村 豪
https://comcomponent.com/en/profile/go-komura/
Building a PowerShell Analysis Tool in PowerShell — Read Scripts with the AST, Not Regular Expressions
https://comcomponent.com/en/blog/powershell-ast-script-analysis-tool/
2026-09-13T06:30:00+00:00
2026-09-14T00:00:00+00:00
Display a real PowerShell AST and see what object each line of code becomes. Walk from ScriptBlockAst to CommandAst and find where Write-Host is called, excluding comments and ordinary strings.
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How Does a Windows Shortcut Find a File You Moved? — A File's Location and Its Identity Are Two Different Things
https://comcomponent.com/en/blog/windows-shortcut-moved-file-tracking/
2026-09-12T03:20:00+00:00
2026-09-13T00:00:00+00:00
Why does a shortcut still open a file you moved? Windows can find the target from tracking identifiers and file characteristics, not just the stored path, within limits.
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Is Safely Removing a USB Drive Still Necessary? — Thinking It Through from Quick Removal and Write Caching
https://comcomponent.com/en/blog/windows-usb-safe-removal-write-cache/
2026-09-12T00:45:00+00:00
2026-09-13T00:00:00+00:00
Can you pull a USB drive once the copy finishes? Write caching, Quick removal versus Better performance, how to check the setting, and what to do when a device is in use.
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Why Does Audio Drop Out When CPU Usage Is Low? — Thinking in Terms of Buffers and Deadlines
https://comcomponent.com/en/blog/windows-audio-dropouts-low-cpu/
2026-09-11T13:45:00+00:00
2026-09-13T00:00:00+00:00
Audio drops out while CPU usage stays low. This explains why from the playback buffer and the refill deadline, why a bigger buffer adds latency, and how to investigate.
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Why Is RDP Sluggish on a Fast Connection? — Separating Input, Rendering, and the Network
https://comcomponent.com/en/blog/windows-rdp-slow-fast-network/
2026-09-11T02:00:00+00:00
2026-09-11T00:00:00+00:00
The speed test is fast, yet Remote Desktop input and scrolling lag. This explains why, from round trips and graphics transfer to symptom comparisons and counter readings.
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The Network Works but Windows Says "No internet" — Isolating NCSI, DNS, Proxy, and VPN on Windows
https://comcomponent.com/en/blog/windows-ncsi-no-internet-connected/
2026-09-11T01:00:00+00:00
2026-09-11T00:00:00+00:00
Why Windows says "No internet" while the network works, starting from the NCSI verdict. Isolate DNS, proxy, VPN, and captive portals with read-only checks and event logs.
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Why Does ‘1 Second Remaining’ Take So Long? — How Progress Bars and Time Estimates Work
https://comcomponent.com/en/blog/progress-bar-remaining-time/
2026-09-08T20:00:00+00:00
2026-09-09T00:00:00+00:00
Learn why a task stays at one second remaining, stalls at 99%, or keeps preparing. Separate progress units, speed estimates, final steps, and UI updates, then compare different displays in an interactive demo.
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Why a Windows File Share Works Sometimes and Fails at Other Times — Troubleshooting Kerberos, NTLM, and Credentials
https://comcomponent.com/en/blog/smb-share-access-troubleshooting/
2026-09-08T09:00:00+00:00
2026-09-09T00:00:00+00:00
Diagnose intermittent Windows file-share access using symptoms and logs. Check names versus IP addresses, app-only failures, blank passwords, error 1219, restarts, and SMB signing, and learn what each result actually proves.
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Disk at 100%: What Do You Actually Have to Stop? — Telling SysMain, Windows Search, and Defender Apart
https://comcomponent.com/en/blog/windows-disk-100-safe-diagnosis/
2026-09-05T04:00:00+00:00
2026-09-07T00:00:00+00:00
Isolate Windows 100% disk usage by throughput, response time, and files. Pause SysMain safely, narrow Windows Search, and analyze Defender without disabling it.
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Same 1 GB, Yet a Photo Folder Copies Slower Than a Single Video — Why?
https://comcomponent.com/en/blog/windows-small-files-copy-slow/
2026-09-05T00:00:00+00:00
2026-09-07T00:00:00+00:00
Why same-size data copies at different speeds on Windows: file count, SSD and NAS latency, ZIP bundling, a create-transfer-extract comparison, and robocopy.
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What Is Windows' Hardware-Accelerated GPU Scheduling? — Does Turning It On Make Your PC Faster?
https://comcomponent.com/en/blog/windows-hardware-accelerated-gpu-scheduling/
2026-09-04T15:00:00+00:00
2026-09-07T00:00:00+00:00
An illustrated, non-technical guide to Windows' hardware-accelerated GPU scheduling (HAGS): how it works, when to turn it on or off, why the setting may be missing, how it relates to frame generation, and how to compare safely.
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The Order of Name Resolution on Windows — hosts, the DNS Cache, LLMNR/mDNS, and DoH
https://comcomponent.com/en/blog/windows-name-resolution-order-hosts-dns-cache-llmnr-mdns-doh/
2026-09-04T01:00:00+00:00
2026-09-07T00:00:00+00:00
Whether hosts, the DNS cache, the DNS server, or LLMNR/mDNS answered decides why some PCs fail. Learn the Windows name resolution order, what DoH changes, and how to isolate each layer.
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Does Turning Off Memory Integrity (HVCI) Make Windows Faster? — What It Means, How to Do It, and How to Decide
https://comcomponent.com/en/blog/windows-memory-integrity-hvci-off-performance/
2026-09-04T01:00:00+00:00
2026-09-07T00:00:00+00:00
Does turning off Memory integrity (HVCI) really speed up a Windows PC? When it can help, when it cannot, how to switch it off and back, and how to decide.
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What Fast Startup Really Does — Why a Windows 'Shutdown' Is Not the Same as a Restart
https://comcomponent.com/en/blog/windows-fast-startup-hybrid-shutdown-explained/
2026-09-04T01:00:00+00:00
2026-09-07T00:00:00+00:00
A Windows shutdown is a hybrid shutdown by default, saving the kernel and drivers to hiberfil.sys. Why only a restart resets them, and when to turn Fast Startup off.
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Time Travel Debugging — Recording and Rewinding the Bugs That Never Reproduce in Long-Running Apps
https://comcomponent.com/en/blog/windows-time-travel-debugging-ttd/
2026-09-02T01:00:00+00:00
2026-09-07T00:00:00+00:00
A once-a-month bug leaves only its result in a crash dump. Record and rewind execution with WinDbg Time Travel Debugging (TTD): TTD.exe, ring buffers, and TTD.Calls.
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Why Arguments Break — The Rules of Windows Command-Line Arguments
https://comcomponent.com/en/blog/windows-command-line-argument-rules/
2026-09-02T01:00:00+00:00
2026-09-07T00:00:00+00:00
Windows passes CreateProcess a single string that the receiver splits. Covers the CommandLineToArgvW, CRT, and .NET rules, ArgumentList, and building it in C++.
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Dark Mode and Contrast Themes in Windows Apps — DWM Dark Title Bars, System Theme Tracking in WinForms/WPF, and Drawing under High Contrast
https://comcomponent.com/en/blog/windows-app-dark-mode-contrast-theme-guide/
2026-09-02T01:00:00+00:00
2026-09-07T00:00:00+00:00
How to make WinForms/WPF apps follow the dark mode and contrast themes of Windows 11. Covers DWM dark title bars, SetColorMode and ThemeMode in .NET 9/10, detecting theme changes, and drawing with system colors under high contrast.
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End of Servicing for Windows Printer Drivers — How Business Apps Should Prepare Their Report and Label Printing
https://comcomponent.com/en/blog/windows-print-driver-end-of-servicing-business-apps/
2026-09-01T01:00:00+00:00
2026-09-07T00:00:00+00:00
Microsoft is phasing out v3/v4 printer drivers. What Windows protected print mode removes, and how to inventory and prepare report and label printing in business apps.
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WinRT Is COM — IInspectable, .winmd, Language Projections, and Why WinUI Still Rests on a Binary Contract
https://comcomponent.com/en/blog/winrt-is-com/
2026-08-29T01:00:00+00:00
2026-09-07T00:00:00+00:00
WinRT is not a managed runtime but an ABI built on COM plus .winmd metadata and language projections. Covers IUnknown vs. IInspectable, HWND setup, and package identity.
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What Is Left After the Parent Dies — Keeping Child Processes in a Job Object
https://comcomponent.com/en/blog/windows-job-object-child-process-lifetime/
2026-08-29T01:00:00+00:00
2026-09-07T00:00:00+00:00
Why do SDK helpers outlive a killed UI and keep the camera or COM port? Designing child process lifetime with Job Objects, KillOnJobClose, and completion ports.
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What Is an OLE Object? — How Embedding and Linking Work and the Pitfalls in Business Documents
https://comcomponent.com/en/blog/what-is-ole-object/
2026-08-28T01:10:00+00:00
2026-09-07T00:00:00+00:00
An OLE object is what embeds an Excel table in Word. Learn embedding vs. linking, compound files, In-Place Activation, broken links, bloat, and security.
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The "Same PC" Is Not the Same Execution Environment — The User Boundary That Separates AppData, HKCU, DPAPI, and Credentials
https://comcomponent.com/en/blog/windows-user-boundary-appdata-hkcu-dpapi/
2026-08-28T01:00:00+00:00
2026-09-07T00:00:00+00:00
Why an app that works on your desk breaks as a task or service: how the Windows user boundary separates AppData, HKCU, DPAPI, browser profiles, and credentials.
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Declarative Configuration Management for Windows with DSC — Starting IaC with dsc.exe
https://comcomponent.com/en/blog/dsc-windows-declarative-iac/
2026-08-28T00:00:00+00:00
2026-09-07T00:00:00+00:00
Move on from runbook scripts that break when re-run. DSC v3 (dsc.exe) declares Windows configuration in YAML and applies it idempotently, with drift detection.
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The Depths of Windows Virtualization (Part 3) — Virtual Machines That Boot in Seconds: Why WSL2, Windows Sandbox, and Containers Are So Light
https://comcomponent.com/en/blog/windows-virtualization-internals-wsl2-sandbox-containers/
2026-08-22T04:00:00+00:00
2026-09-07T00:00:00+00:00
Why WSL2 and Windows Sandbox boot in seconds and stay light: dynamic base images, direct map, dynamic memory allocation, and Hyper-V isolated containers explained.
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The Depths of Windows Virtualization (Part 2) — Memory Even the Kernel Cannot See: How VBS, HVCI, and Credential Guard Work
https://comcomponent.com/en/blog/windows-virtualization-internals-vbs-hvci-credential-guard/
2026-08-22T03:00:00+00:00
2026-09-07T00:00:00+00:00
Enabled by default on a clean install to compatible hardware, VBS uses the hypervisor and SLAT to isolate beyond the kernel. Covers VTLs, the Secure Kernel, HVCI, and Credential Guard.
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The Depths of Windows Virtualization (Part 1) — Where Is Your Windows Actually Running? The Hypervisor and Partitions
https://comcomponent.com/en/blog/windows-virtualization-internals-hypervisor/
2026-08-22T02:00:00+00:00
2026-09-07T00:00:00+00:00
When you enable Hyper-V, the host Windows itself runs as the root partition on top of the hypervisor. This article explains the foundations of virtualization, from VT-x and SLAT to VMBus.
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The Win32 Thread Pool API — Concurrency That Does Not Create Threads, with CreateThreadpoolWork
https://comcomponent.com/en/blog/win32-thread-pool-api/
2026-08-22T01:40:00+00:00
2026-09-07T00:00:00+00:00
Calling CreateThread everywhere in native code? A primary-source guide to the Win32 thread pool API: the work, timer, wait, and io objects, cleanup groups, and callback rules.
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Named Pipes in Practice — Windows' Standard IPC from Design to Security
https://comcomponent.com/en/blog/windows-named-pipes-practical-guide/
2026-08-22T01:30:00+00:00
2026-09-07T00:00:00+00:00
A practical guide to named pipes, Windows' standard IPC. Covers byte vs. message mode, servers that handle multiple clients, ACL and impersonation security, and .NET's named-pipe stream classes, from primary sources.
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Apps That Break on Resume from Sleep — How Power Events Work and How to Build Business Apps That Survive Resume
https://comcomponent.com/en/blog/windows-sleep-resume-power-events/
2026-08-22T01:20:00+00:00
2026-09-08T00:00:00+00:00
Why business apps break after a laptop resumes from sleep: WM_POWERBROADCAST notifications, Modern Standby, reconnect design, sleep suppression, and powercfg.
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DllMain and the Loader Lock — The Real Reason You Are Told to "Do Nothing in DLL Initialization"
https://comcomponent.com/en/blog/dllmain-loader-lock/
2026-08-22T01:10:00+00:00
2026-09-08T00:00:00+00:00
Why DllMain must not call LoadLibrary or wait on threads: the loader lock serializes DLL notifications, typical deadlocks, deferred initialization, and hang investigation.
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