Windows 11 Insider Preview Build 26300.7939 introduces a new registry switch that locks batch files during execution to prevent modifications that can cause errors. Users can enable this feature by creating a DWORD value named LockBatchFilesWhenInUse in the registry and setting it to 1, which ensures the command processor locks batch files for the duration of their run. This addition addresses previous issues where "file in use" errors occurred due to scripts being edited while still executing, particularly after driver updates. Although this lock is beneficial for environments with potential interference from rogue installers, it may be unnecessary for controlled settings where batch files are used safely

Windows 11 Insider Preview Build 26300.7939 Dev Channel: What's new

Windows 11 Insider Preview Build 26300.7939 adds a registry switch that locks batch files while they execute, preventing mid‑run modifications that can cause “file in use” errors. The setting is enabled by creating a DWORD value named LockBatchFilesWhenInUse under HKLM\Software\Microsoft\Command Processor and setting it to 1. Once active, the command processor holds an exclusive lock on each batch file for the entire run, which stops rogue installers or driver updates from corrupting scripts on the fly. After applying the tweak, a simple self‑modifying script runs without error, confirming the protection is working.

Windows 11 Insider Preview Build 26300.7939 Dev Channel: What's new @ NT Compatible