Should I block it?
No, this file is 100% safe to run.
 
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        RtkApoApi.dll
Realtek APO API by Realtek Semiconductor Corp (Signed)
| Version: | 1, 0, 0, 68 | 
| MD5: | 8fe0e3e4a8b02c315fa33a9f5085fd5a | 
| SHA1: | fb0763cb1387df8ac3199132e94ca76675b429bf | 
Overview
rtkapoapi.dll is loaded as dynamic link library that runs in the context of a process. The file is digitally signed by Realtek Semiconductor Corp which was issued by the VeriSign certificate authority (CA). This particular version is usually found on Windows 8 Pro (6.2.9200.0).
 Details
Details
| File name: | rtkapoapi.dll | 
| Publisher: | Realtek Semiconductor Corp. | 
| Product name: | Realtek APO API | 
| Typical file path: | C:\Windows\System32\rtkapoapi.dll | 
| File version: | 1, 0, 0, 68 | 
| Size: | 751.71 KB (769,752 bytes) | 
| Build date: | 8/2/2013 2:13 PM | 
| Certificate | 
| Issued to: | Realtek Semiconductor Corp | 
| Authority (CA): | VeriSign | 
| Expiration date: | Wednesday, December 7, 2016 | 
| Digital DNA | 
| PE subsystem: | Windows GUI | 
| File packed: | No | 
| .NET CLR: | No | 
More details
 Distribution by Windows OS
Distribution by Windows OS
| OS version | distribution | 
| Windows 8 Pro | 100.00% |  | 
 Distribution by PC manufacturer
Distribution by PC manufacturer
| PC Manufacturer | distribution | 
| Hewlett-Packard | 100.00% |  |