Fix for codeplex issue 6575
Fix for codeplex issue 6575

This fix inject the pattern in the archive file name pattern so that even if user do not provide pattern in file name , code will inject it.
ilya-g/NLog,michaeljbaird/NLog,UgurAldanmaz/NLog,ajayanandgit/NLog,snakefoot/NLog,Niklas-Peter/NLog,rajeshgande/NLog,thomkinson/NLog,littlesmilelove/NLog,blair55/NLog,vladikk/NLog,AqlaSolutions/NLog-Unity3D,rajk987/NLog,vbfox/NLog,AndreGleichner/NLog,mikkelxn/NLog,campbeb/NLog,babymechanic/NLog,bryjamus/NLog,rajk987/NLog,UgurAldanmaz/NLog,thomkinson/NLog,tohosnet/NLog,pwelter34/NLog,hubo0831/NLog,tohosnet/NLog,thomkinson/NLog,AqlaSolutions/NLog-Unity3D,littlesmilelove/NLog,BrandonLegault/NLog,kevindaub/NLog,ie-zero/NLog,MartinTherriault/NLog,matteobruni/NLog,RichiCoder1/NLog,luigiberrettini/NLog,michaeljbaird/NLog,mikkelxn/NLog,bhaeussermann/NLog,breyed/NLog,vladikk/NLog,czema/NLog,czema/NLog,MoaidHathot/NLog,RichiCoder1/NLog,RRUZ/NLog,MartinTherriault/NLog,rajk987/NLog,blair55/NLog,Niklas-Peter/NLog,bjornbouetsmith/NLog,bhaeussermann/NLog,BrutalCode/NLog,vladikk/NLog,BrutalCode/NLog,mikkelxn/NLog,campbeb/NLog,pwelter34/NLog,blair55/NLog,hubo0831/NLog,babymechanic/NLog,BrandonLegault/NLog,nazim9214/NLog,AqlaSolutions/NLog-Unity3D,tetrodoxin/NLog,sean-gilliam/NLog,czema/NLog,tmusico/NLog,blair55/NLog,bjornbouetsmith/NLog,AndreGleichner/NLog,304NotModified/NLog,RRUZ/NLog,breyed/NLog,FeodorFitsner/NLog,blair55/NLog,NLog/NLog,BrandonLegault/NLog,ilya-g/NLog,fringebits/NLog,ie-zero/NLog,czema/NLog,ArsenShnurkov/NLog,bryjamus/NLog,vbfox/NLog,kevindaub/NLog,ajayanandgit/NLog,rajeshgande/NLog,mikkelxn/NLog,thomkinson/NLog,nazim9214/NLog,blair55/NLog,fringebits/NLog,tmusico/NLog,FeodorFitsner/NLog,ArsenShnurkov/NLog,zbrad/NLog,MoaidHathot/NLog,vladikk/NLog,AqlaSolutions/NLog-Unity3D,luigiberrettini/NLog,rajk987/NLog,BrandonLegault/NLog,matteobruni/NLog,tetrodoxin/NLog,fringebits/NLog,fringebits/NLog,zbrad/NLog