One Floor App (Simply Tech/Widdit) distributes and bundles potentially unwanted programs (PUPs) using its OneFloorApp install manager (SimplyInstaller). Interop.IWshRuntimeLibrary.dll is the library is an interop assembly of the IWshRuntimeLibrary and is recompiled by One Floor App. The file Interop.IWshRuntimeLibrary.dll, re-signed by One Floor App, is an Interop assembly that has been intergated by a 3rd-party into a .Net application, even though the assembly itself is most likely safe, it has been recompiled by a potentially unwanted program. The program is a setup application that uses the Widdit Setup installer. Note, this is a common distributed file and although it has been detected it might not be a threat is un-coupled from its distribution source.