winstore.mobile.exe is a program which is most likely legit. So, if winstore.mobile.exe is on your system, it is most likely ok, and will NOT cause problems. Even if your PC is clean, it is still recommended to purchase a well-known antivirus with a good track record, in order to yourself your system against threats.
Usually, this program is located in C:\Program Files\WindowsApps\Microsoft.WindowsStore_2015.7.1.0_x86__8wekyb3d8bbwe\WinStore.Mobile.exe.
The MD5 checksum for this file is 63ba42152e8d770ed50b4ce7238755b9.
This application is NOT registered as a Windows service. This is very good.
This application runs in 32-bit mode. It does not exploit the full set of features of current PC chips. This is quite normal because the publishers did not upgrade it to 64-bit code.
The description stored in the exe is Store.
File version extracted from the file 2015.07.01.1.
Author Microsoft Corporation.
Legal copyright notice Copyright © 2015.
winstore.mobile.exe appears to have a visible user interface. This means it doesn't run in a kind of stealth mode. Its operation is clearly displayed to you.
The digital signature is missing from this program. The authors did not bother to sign it. This is probably bad.
This executable does NOT have a removal routine stored in registry.