Should I block it?
No, this file is 100% safe to run.
 
Relationships
     
    
        AcShellExtensionRes.dll
AutoCAD by Autodesk Development Sarl (Signed)
| Version:    | 19.1.18.0.0 | 
| MD5:    | 75d2a1b657499a05f9ceca5f64711e4b | 
| SHA1:    | 13a0dc80e5def779138a6dbbe8f4ada5f40a6d14 | 
Overview
acshellextensionres.dll is loaded as dynamic link library that runs in the context of a process. The file is digitally signed by Autodesk Development Sarl which was issued by the VeriSign certificate authority (CA). This particular version is usually found on Windows 8 Pro (6.2.9200.0).
Details
| File name: | acshellextensionres.dll | 
| Publisher: | Autodesk | 
| Product name: | AutoCAD | 
| Description: | AutoCAD Dwg shell extension - common property name  resource file | 
| Typical file path: | C:\Program Files\common files\autodesk shared\acshellex\csy\acshellextensionres.dll | 
| File version: | 19.1.18.0.0 | 
| Size: | 9.3 KB (9,528 bytes) | 
| Build date: | 2/8/2013 8:19 AM | 
| Certificate | 
| Issued to: | Autodesk Development Sarl | 
| Authority (CA): | VeriSign | 
| Digital DNA | 
| PE subsystem: | Windows GUI | 
| File packed: | No | 
| .NET CLR: | No | 
More details
Distribution by Windows OS
| OS version | distribution | 
| Windows 8 Pro | 
100.00% | 
 | 
Distribution by PC manufacturer
| PC Manufacturer | distribution | 
| Hewlett-Packard | 
100.00% | 
 |