Even if the file exists, your system might not know where to look. Locate the folder where you installed MinGW (commonly C:\msys64\ucrt64\bin C:\msys64\mingw64\bin Add this path to your Windows Environment Variables Avoid paths with spaces (like C:\Program Files\MinGW\bin ), as some GNU tools struggle to parse them. 3. Specific Fix for Rustaceans If you are using , ensure you have the rust-mingw component installed: rustup component add rust-mingw
: Malicious software occasionally uses the names of legitimate system or development tools to hide in plain sight. If you find dlltool.exe in a suspicious folder (such as a temporary folder rather than a development bin directory), it should be scanned with Microsoft Defender or Malwarebytes . dlltoolexe