Set executable permissions to files with Executable flag

DepotDownloader/ContentDownloader.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.IO;
@@ -7,6 +7,7 @@ using System.Net;
 using System.Threading;
 using System.Threading.Tasks;
 using SteamKit2;
+using Mono.Unix;
 
 namespace DepotDownloader
 {
@@ -1046,6 +1047,11 @@ namespace DepotDownloader
                     throw new ContentDownloaderException(String.Format("Failed to allocate file {0}: {1}", fileFinalPath, ex.Message));
                 }
 
+                if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows) && file.Flags.HasFlag(EDepotFileFlag.Executable))
+                {
+                    UnixFileSystemInfo.GetFileSystemEntry(fileFinalPath).FileAccessPermissions |= FileAccessPermissions.UserExecute | FileAccessPermissions.GroupExecute | FileAccessPermissions.OtherExecute;
+                }
+
                 neededChunks = new List<ProtoManifest.ChunkData>(file.Chunks);
             }
             else

DepotDownloader/DepotDownloader.csproj

@@ -13,5 +13,6 @@
   <ItemGroup>
     <PackageReference Include="protobuf-net" Version="3.0.101" />
     <PackageReference Include="SteamKit2" Version="2.4.0-Alpha.2" />
+    <PackageReference Include="Mono.Posix.NETStandard" Version="1.0.0" />
   </ItemGroup>
 </Project>