Download ac1st21.dll file for Windows 7, Windows 8, Windows 10 and fix ac1st21.dll is missing or not found dll error. The latest version of ac1st21.dll file is v184.108.40.206 which is a 64 with a file size of approximately 0.35 MB. Autodesk, Inc. is the developer of ac1st21.dll and the file belongs to AutoCAD component.
DLL stands for Dynamic Link Library. ac1st21.dll is a file that contains code, resources and data that other programs can use. Thus, Dlls provide a way to modularize applications so that their functionality can be updated and reused by other applications. Dll's also help to reduce application size and memory footprint since many applications can share the same code contained in a single Dll file such as ac1st21.dll.
If you are here because your seeing ac1st21.dll errors in your Windows such as :
There are number of ways to fix ac1st21.dll errors. Below you will find 2 such ways:
Where do I put ac1st21.dll file? Download ac1st21.dll and copy it to the application’s installation folder.
Make sure to download ac1st21.dll 32-bit file for 32-bit Windows operating system and ac1st21.dll 64-bit file for 64-bit Windows operating system if they are available. Most new Windows systems would probably be a 64-bit one. You can check to see if your computer is running a 32-bit or a 64-bit version of Windows by doing:Windows 10 and Windows 8.1
After you are done with above installation instructions, try restarting the application throwing ac1st21.dll is missing error.
If that doesn’t fix the error, copy the ac1st21.dll to the systems directory. This can vary between Windows OS versions. Check out the systems directory path for different Windows versions below:
Restart your Windows and see if the error is fixed.
If the error persists, try to register the ac1st21.dll in Windows registry. This can be done by using the “REGSVR32” command prompt and giving the dll file ac1st21.dll.
Make sure you run the command as administrator from the Run Box.
Once you are done registering the ac1st21.dll in the Windows system’s registry, you should be good to go. Restart your Windows once again and ac1st21.dll missing error should be fix.
Clicking on 'Download ac1st21.dll' button below will take you to the download page where you will see list of ac1st21.dll versions with bit, file size and other details of of the file. It is recommended to download the latest version of ac1st21.dll to fix dll errors which is v220.127.116.11.