Btwapi.dll is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like btwapi.dll, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like MpSigStub.exe - to follow. These files were created so that multiple programs (eg. BlackBerry Desktop Manager) could share the same btwapi.dll file, saving valuable memory allocation, therefore making your computer run more efficiently.
Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. If something happens to a shared DLL file, either it goes missing or gets corrupted in some way, it can generate a "runtime" error message. Runtime is pretty self-explanatory; it means that these errors are triggered when btwapi.dll is attempted to be loaded either when BlackBerry Desktop Manager is starting up, or in some cases already running. Some of the most common btwapi.dll errors include:
- Access Violation at address - btwapi.dll.
- Btwapi.dll could not be found.
- Cannot find C:\Windows\SysWOW64\btwapi.dll.
- Cannot register btwapi.dll.
- Cannot start BlackBerry Desktop Manager. A required component is missing: btwapi.dll. Please install BlackBerry Desktop Manager again.
- Failed to load btwapi.dll.
- The application has failed to start because btwapi.dll was not found.
- The file btwapi.dll is missing or corrupt.
- This application failed to start because btwapi.dll was not found. Re-installing the application may fix this problem.
Your btwapi.dll file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with BlackBerry Desktop Manager), or deleted by a malware infection. Furthermore, btwapi.dll file corruption could be caused from a power outage when loading BlackBerry Desktop Manager, system crash while loading btwapi.dll, bad sectors on your storage media (usually your primary hard drive), or quite commonly, a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.