winstore.app.exe is a program which is probably legit. So, if winstore.app.exe is on your laptop or desktop computer, it is probably ok, and will NOT cause problems. Even if your system is clean, we still advise you to run a good antivirus with a good track record, in order to defend your PC against viruses and malware.
Usually, this program is stored in C:\Program Files\WindowsApps\Microsoft.WindowsStore_11912.1001.1.0_x64__8wekyb3d8bbwe\WinStore.App.exe.
The MD5 fingerprint for this file is c12917404a3e42560c78e28d9e69e6ee.
This program does NOT run as a Windows service. This is normally a good sign.
This is a 64-bit executable. It runs using the full capacity of nowadays' CPUs.
The description extracted from the exe is Store.
File version stored as a property 11912.1001.1.0.
Company name Microsoft Corporation.
Copyright notice Copyright © 2015.
winstore.app.exe appears to have visible windows. This is good because it doesn't operate in some kind of stealth mode. Its activity is clearly displayed to the user.
A digital signature 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 set up in registry.