winuapentry.exe is a application which is most likely NOT a virus or malware. So, if winuapentry.exe is on your PC, it is most likely ok, and will NOT cause problems. Even if your PC is virus-free, it is still recommended to purchase a good antivirus with a good detection rate, in order to yourself your PC against viruses and malware.
This program is normally stored in C:\Program Files\WindowsApps\Facebook.Facebook_140.1135.47783.0_x86__8xx8rvfyw5nnt\WinUAPEntry.exe.
The MD5 fingerprint for this executable is f5822aef8c1d402b7cc9b38790ca3e01.
This program is NOT registered as a Windows service. This is very good.
This executable uses the net to communicate. Today this is ok. For example, most of the programs on your computer check for new updates. For this, Internet communications are required.
This application runs as a 32-bit program. It does not use the full power of nowadays' PC CPUs. This is quite normal because the authors did not upgrade it to use the x64 instruction set.
winuapentry.exe appears to have visible windows. This means it doesn't work in some kind of invisible mode. Its activity is clearly shown to the user.
The digital certificate is missing from this program. The publisher did not bother to sign it. This is usually bad.
This program does NOT have an uninstall routine stored in registry.