What causes the fltlib.dll is either not designed for Windows issue? 

There could be various reasons why you see this error; some of the common reasons are:

Malware infection – When your computer is infected with viruses or malware, it could cause the DLL to get corrupted. To remove the infection from your computer, you need to run a malware scan using a reliable antivirus tool. Deleted accidentally – If you have uninstalled a program that used the dll file, it is possible that the file got deleted. Hence the error. Bad sector on the hard drive – Bad sectors on the hard drive cause many issues; one such issue could be the DLL file missing. The DLL file got corrupted – If the DLL file got corrupted or damaged, you might not be able to use the file. So, when you try to launch an app or game that uses the DLL file, you may get the error.

What can I do to fix the fltlib.dll is either not designed for Windows issue?

1. Run SFC and DISM command

If the manual method mentioned above seems tedious, we recommend you try specialized software to perform this job. A safe option for specialized software is Restoro, a tool designed to scan your device for corrupt or broken OS components and automatically search for healthy files from its online database as replacements.

2. Install Windows updates if pending

3. Run a malware scan 

4. Run the computer in a clean boot environment

5. Perform  System Restore

6. Reinstall Windows on your computer

6.1 Create a bootable drive

6.2  Install Windows

So, these are the methods to fix the fltlib.dll is not designed for Windows issue. But try them and let us know what worked for you in the comments section below.

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