diff --git a/build/prepare-install-package.targets b/build/prepare-install-package.targets
index 5ba6ed37..dd15fb52 100644
--- a/build/prepare-install-package.targets
+++ b/build/prepare-install-package.targets
@@ -62,12 +62,12 @@
       <PackageFiles Include="$(PackagePath)\**\*.*" />
     </ItemGroup>
     <Copy SourceFiles="@(PackageFiles)" DestinationFolder="$(PackageDevPath)\%(RecursiveDir)" />
-    <ZipDirectory FromDirPath="$(PackageDevPath)\bundle" ToFilePath="$(PackageDevPath)\internal\bundle.$(PackageBundlePlatform).zipped" />
+    <ZipDirectory FromDirPath="$(PackageDevPath)\bundle" ToFilePath="$(PackageDevPath)\internal\$(PackageBundlePlatform).dat" />
     <RemoveDir Directories="$(PackageDevPath)\bundle" />
 
     <!-- finalise normal installer -->
     <ReplaceFileText FilePath="$(PackagePath)\bundle\smapi-internal\StardewModdingAPI.config.json" Search="&quot;DeveloperMode&quot;: true" Replace="&quot;DeveloperMode&quot;: false" />
-    <ZipDirectory FromDirPath="$(PackagePath)\bundle" ToFilePath="$(PackagePath)\internal\bundle.$(PackageBundlePlatform).zipped" />
+    <ZipDirectory FromDirPath="$(PackagePath)\bundle" ToFilePath="$(PackagePath)\internal\$(PackageBundlePlatform).dat" />
     <RemoveDir Directories="$(PackagePath)\bundle" />
   </Target>
 
diff --git a/docs/technical-docs.md b/docs/technical-docs.md
index 88c1a91f..83e4ea2b 100644
--- a/docs/technical-docs.md
+++ b/docs/technical-docs.md
@@ -58,12 +58,12 @@ on the wiki for the first-time setup.
 
 2. In Windows:
    1. Rebuild the solution in Release mode.
-   2. Copy `bundle.windows.zipped` from `bin/SMAPI installer` and `bin/SMAPI installer for developers`
-      to Linux/Mac.
+   2. Copy `windows.dat` from `bin/SMAPI installer` and `bin/SMAPI installer for developers` to
+      Linux/Mac.
 
 3. In Linux/Mac:
    1. Rebuild the solution in Release mode.
-   2. Add the `bundle.windows.zipped` files to the `bin/SMAPI installer` and
+   2. Add the `windows.dat` files to the `bin/SMAPI installer` and
       `bin/SMAPI installer for developers` folders.
    3. Rename the folders to `SMAPI <version> installer` and `SMAPI <version> installer for developers`.
    4. Zip the two folders.
diff --git a/src/SMAPI.Installer/Program.cs b/src/SMAPI.Installer/Program.cs
index 4056e52a..c56c9f80 100644
--- a/src/SMAPI.Installer/Program.cs
+++ b/src/SMAPI.Installer/Program.cs
@@ -33,7 +33,7 @@ namespace StardewModdingApi.Installer
         {
             // find install bundle
             PlatformID platform = Environment.OSVersion.Platform;
-            FileInfo zipFile = new FileInfo(Path.Combine(Program.InstallerPath, $"bundle.{(platform == PlatformID.Win32NT ? "windows" : "mono")}.zipped"));
+            FileInfo zipFile = new FileInfo(Path.Combine(Program.InstallerPath, $"{(platform == PlatformID.Win32NT ? "windows" : "mono")}.dat"));
             if (!zipFile.Exists)
             {
                 Console.WriteLine($"Oops! Some of the installer files are missing; try redownloading the installer. (Missing file: {zipFile.FullName})");
diff --git a/src/SMAPI.Installer/README.txt b/src/SMAPI.Installer/README.txt
index 72617240..abff9938 100644
--- a/src/SMAPI.Installer/README.txt
+++ b/src/SMAPI.Installer/README.txt
@@ -24,8 +24,8 @@ Manual install
 THIS IS NOT RECOMMENDED FOR MOST PLAYERS. See instructions above instead.
 If you really want to install SMAPI manually, here's how.
 
-1. Unzip "internal/bundle.windows.zipped" (on Windows) or "internal/bundle.mono.zipped" (on
-   Linux/Mac). You can change '.zipped' to '.zip', it's just a normal zip file.
+1. Unzip "internal/windows.dat" (on Windows) or "internal/mono.dat" (on Linux/Mac). You can change
+   '.dat' to '.zip', it's just a normal zip file renamed to prevent confusion.
 2. Copy the files from the folder you just unzipped into your game folder. The
    `StardewModdingAPI.exe` file should be right next to the game's executable.
 3.