fix: Adjust ToolLocator for all platforms

sources/core/Stride.Core.Design/IO/UPath.cs

@@ -290,11 +290,25 @@ public override string ToString()
         /// </summary>
         /// <returns>A string representation of this path in windows form.</returns>
         [NotNull]
+        [Obsolete("Use ToOSPath() instead")]
         public string ToWindowsPath()
         {
             return FullPath.Replace('/', '\\');
         }
 
+        /// <summary>
+        /// Converts this path to a OS path, 
+        /// by replacing each separator with the current operating system
+        /// <see cref="Path.DirectorySeparatorChar"/> 
+        /// </summary>
+        ///<returns>A normalized string path</returns>
+
+        [NotNull]
+        public string ToOSPath()
+        {
+            return FullPath.Replace('/', Path.DirectorySeparatorChar); 
+        }
+
         /// <summary>
         /// Implements the ==.
         /// </summary>

sources/engine/Stride.Assets/Media/SoundAssetCompiler.cs

@@ -41,7 +41,7 @@ public DecodeSoundFileCommand(string url, SoundAsset parameters, IAssetFinder as
             protected override async Task<ResultStatus> DoCommandOverride(ICommandContext commandContext)
             {
                 // Get path to ffmpeg
-                var ffmpeg = ToolLocator.LocateTool("ffmpeg.exe")?.ToWindowsPath() ?? throw new AssetException("Failed to compile a sound asset, ffmpeg was not found.");
+                var ffmpeg = ToolLocator.LocateTool("ffmpeg")?.ToOSPath() ?? throw new AssetException("Failed to compile a sound asset, ffmpeg was not found.");
 
                 // Get absolute path of asset source on disk
                 var assetDirectory = Parameters.Source.GetParent();

sources/engine/Stride.Assets/Media/VideoAssetCompiler.cs

@@ -83,7 +83,7 @@ protected override async Task<ResultStatus> DoCommandOverride(ICommandContext co
                 try
                 {
                     // Get path to ffmpeg
-                    var ffmpeg = ToolLocator.LocateTool("ffmpeg.exe")?.ToWindowsPath() ?? throw new AssetException("Failed to compile a video asset, ffmpeg was not found.");
+                    var ffmpeg = ToolLocator.LocateTool("ffmpeg")?.ToOSPath() ?? throw new AssetException("Failed to compile a video asset, ffmpeg was not found.");
 
                     // Get absolute path of asset source on disk
                     var assetDirectory = videoAsset.Source.GetParent();

sources/engine/Stride.Assets/SpriteFont/Compiler/SignedDistanceFieldFontImporter.cs

@@ -129,7 +129,7 @@ public void Import(SpriteFontAsset options, List<char> characters)
                 return;
 
             // Get the msdfgen.exe location
-            var msdfgen = ToolLocator.LocateTool("msdfgen.exe") ?? throw new AssetException("Failed to compile a font asset, msdfgen was not found.");
+            var msdfgen = ToolLocator.LocateTool("msdfgen").ToOSPath() ?? throw new AssetException("Failed to compile a font asset, msdfgen was not found.");
 
             msdfgenExe = msdfgen.FullPath;
             tempDir = $"{Environment.GetEnvironmentVariable("TEMP")}\\";

sources/engine/Stride.Assets/ToolLocator.cs

@@ -7,21 +7,32 @@
 using System.Threading.Tasks;
 using Stride.Core.IO;
 
-namespace Stride.Assets
+namespace Stride.Assets;
+
+static class ToolLocator
 {
-    static class ToolLocator
+    public static UFile LocateTool(string toolName)
     {
-        public static UFile LocateTool(string toolName)
+        if(!OperatingSystem.IsWindows())
         {
-            var tool = UPath.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), new UFile(toolName));
-            if (File.Exists(tool))
-                return tool;
-
-            tool = UPath.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), new UFile($"../../content/{toolName}"));
-            if (File.Exists(tool))
-                return tool;
+            var pathDirectories = Environment.GetEnvironmentVariable("PATH")?.Split(':') ?? Array.Empty<string>();
 
-            return null;
+            foreach (var directory in pathDirectories)
+            {
+                var toolLocation = Path.Combine(directory, toolName);
+                if (File.Exists(toolLocation))
+                    return new UFile(toolLocation);
+            }
         }
+
+        var tool = UPath.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), new UFile($"{toolName}.exe"));
+        if (File.Exists(tool))
+            return tool;
+
+        tool = UPath.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), new UFile($"../../content/{toolName}.exe"));
+        if (File.Exists(tool))
+            return tool;
+
+        return null;
     }
 }