Pass null for lpApplicationName and put the program as the first token of lpCommandLine. Per the Windows docs, this makes CreateProcessW perform the standard program search (parent-app dir, CWD, system dirs, PATH) and append ".exe" when the name has no extension. So a bare command name like `wsl` or `pwsh` from the Ghostty config now resolves without any PATH/PATHEXT handling on our side. The child also sees its argv[0] exactly as written rather than replaced with the resolved absolute path. Co-authored-by: Claude <noreply@anthropic.com>