fzshellext_64.dll is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like fzshellext_64.dll, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like FileCoAuth.exe - to follow. These files were created so that multiple programs (eg. FileZilla) could share the same fzshellext_64.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 fzshellext_64.dll is attempted to be loaded either when FileZilla is starting up, or in some cases already running. Some of the most common fzshellext_64.dll errors include:
- Access Violation at address - fzshellext_64.dll.
- fzshellext_64.dll could not be found.
- Cannot find C:\Program Files (x86)\FileZilla FTP Client\fzshellext_64.dll.
- Cannot register fzshellext_64.dll.
- Cannot start FileZilla. A required component is missing: fzshellext_64.dll. Please install FileZilla again.
- Failed to load fzshellext_64.dll.
- The application has failed to start because fzshellext_64.dll was not found.
- The file fzshellext_64.dll is missing or corrupt.
- This application failed to start because fzshellext_64.dll was not found. Re-installing the application may fix this problem.
Your fzshellext_64.dll file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with FileZilla), or deleted by a malware infection. Furthermore, fzshellext_64.dll file corruption could be caused from a power outage when loading FileZilla, system crash while loading fzshellext_64.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.
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