diff --git a/docs/release-notes.md b/docs/release-notes.md
index 69eab3ec..d60156d5 100644
--- a/docs/release-notes.md
+++ b/docs/release-notes.md
@@ -5,6 +5,7 @@
 * For players:
   * Updated for Stardew Valley 1.5.5.
   * Updated compatibility list.
+  * Added support for loading BmFont `.fnt` files for [custom languages](https://stardewvalleywiki.com/Modding:Custom_languages) through the [content API](https://stardewvalleywiki.com/Modding:Modder_Guide/APIs/Content).
   * Added `set_farm_type` [console command](https://stardewvalleywiki.com/Modding:Console_commands#Console_commands) to change the current farm type.
   * Fixed installer window closing immediately if the installer crashed.
 
diff --git a/src/SMAPI/Framework/ContentManagers/ModContentManager.cs b/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
index bf0b54b9..beb90a5d 100644
--- a/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
+++ b/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
@@ -2,6 +2,7 @@ using System;
 using System.Globalization;
 using System.IO;
 using System.Linq;
+using BmFont;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Graphics;
@@ -129,6 +130,14 @@ namespace StardewModdingAPI.Framework.ContentManagers
                         }
                         break;
 
+                    // unpacked Bitmap font
+                    case ".fnt":
+                        {
+                            string source = File.ReadAllText(file.FullName);
+                            asset = (T)(object)new XmlSource(source);
+                        }
+                        break;
+
                     // unpacked data
                     case ".json":
                         {
@@ -171,7 +180,7 @@ namespace StardewModdingAPI.Framework.ContentManagers
                         break;
 
                     default:
-                        throw GetContentError($"unknown file extension '{file.Extension}'; must be one of '.json', '.png', '.tbin', or '.xnb'.");
+                        throw GetContentError($"unknown file extension '{file.Extension}'; must be one of '.fnt', '.json', '.png', '.tbin', or '.xnb'.");
                 }
             }
             catch (Exception ex) when (!(ex is SContentLoadException))
diff --git a/src/SMAPI/SMAPI.csproj b/src/SMAPI/SMAPI.csproj
index 4f9aa9b1..b99028da 100644
--- a/src/SMAPI/SMAPI.csproj
+++ b/src/SMAPI/SMAPI.csproj
@@ -31,6 +31,7 @@
     <Reference Include="..\..\build\0Harmony.dll" Private="True" />
     <Reference Include="Stardew Valley" HintPath="$(GamePath)\Stardew Valley.dll" Private="False" />
     <Reference Include="StardewValley.GameData" HintPath="$(GamePath)\StardewValley.GameData.dll" Private="False" />
+    <Reference Include="BmFont" HintPath="$(GamePath)\BmFont.dll" Private="False" />
     <Reference Include="GalaxyCSharp" HintPath="$(GamePath)\GalaxyCSharp.dll" Private="False" />
     <Reference Include="Lidgren.Network" HintPath="$(GamePath)\Lidgren.Network.dll" Private="False" />
     <Reference Include="MonoGame.Framework" HintPath="$(GamePath)\MonoGame.Framework.dll" Private="False" />