Should I block it?

No, this file is 100% safe to run.

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HookKey.dll

mtc HookKey by mtc

Remove HookKey.dll
Version:   1, 0, 0, 0
MD5:   f125349c77069bc194ac325c006f2a65
SHA1:   58e7425b4da759ff730b91944b3413110aab0558
SHA256:   d1f0f50aaa8cf7681043a4412b105bf5f06e2dd8c318ec823eab843531edc409

Overview

hookkey.dll is loaded as dynamic link library that runs in the context of a process. This particular version is usually found on Microsoft Windows XP (5.1.2600.196608).

DetailsDetails

File name:hookkey.dll
Publisher:mtc
Product name:mtc HookKey
Description:HookKey
Typical file path:C:\Windows\System32\drivers\hookkey.dll
File version:1, 0, 0, 0
Size:48 KB (49,152 bytes)
Build date:1/27/2005 8:19 AM
Digital DNA
PE subsystem:Windows GUI
File packed:No
.NET CLR:No
More details

Windows OS versionsDistribution by Windows OS

OS versiondistribution
Microsoft Windows XP 100.00%
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