diff --git a/PowerKit/Extensions/AssemblyExtensions.cs b/PowerKit/Extensions/AssemblyExtensions.cs
index 4264bb0..74d4786 100644
--- a/PowerKit/Extensions/AssemblyExtensions.cs
+++ b/PowerKit/Extensions/AssemblyExtensions.cs
@@ -44,6 +44,7 @@ public string GetManifestResourceString(string resourceName, Encoding encoding)
         public string GetManifestResourceString(string resourceName) =>
             assembly.GetManifestResourceString(resourceName, Encoding.UTF8);
 
+#if NET40_OR_GREATER || NETSTANDARD || NET
         /// <summary>
         /// Reads the specified manifest resource as a string using the specified encoding asynchronously.
         /// Throws <see cref="MissingManifestResourceException" /> if the resource is not found.
@@ -75,6 +76,7 @@ public async Task<string> GetManifestResourceStringAsync(
             await assembly
                 .GetManifestResourceStringAsync(resourceName, Encoding.UTF8, cancellationToken)
                 .ConfigureAwait(false);
+#endif
 
         /// <summary>
         /// Extracts the specified manifest resource to a file at the given path.
@@ -93,6 +95,7 @@ public void ExtractManifestResource(string resourceName, string filePath)
             destination.Flush();
         }
 
+#if NET40_OR_GREATER || NETSTANDARD || NET
         /// <summary>
         /// Extracts the specified manifest resource to a file at the given path asynchronously.
         /// Throws <see cref="MissingManifestResourceException" /> if the resource is not found.
@@ -121,5 +124,6 @@ public async Task ExtractManifestResourceAsync(
             await source.CopyToAsync(destination, 81920, cancellationToken).ConfigureAwait(false);
             await destination.FlushAsync(cancellationToken).ConfigureAwait(false);
         }
+#endif
     }
 }
diff --git a/PowerKit/Extensions/AsyncEnumerableExtensions.cs b/PowerKit/Extensions/AsyncEnumerableExtensions.cs
index ec506f9..29f7134 100644
--- a/PowerKit/Extensions/AsyncEnumerableExtensions.cs
+++ b/PowerKit/Extensions/AsyncEnumerableExtensions.cs
@@ -1,3 +1,4 @@
+#if NET40_OR_GREATER || NETSTANDARD || NET
 using System;
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;
@@ -84,3 +85,4 @@ var item in source
         public ValueTaskAwaiter<List<T>> GetAwaiter() => source.ToListAsync().GetAwaiter();
     }
 }
+#endif
diff --git a/PowerKit/Extensions/EnumerableExtensions.cs b/PowerKit/Extensions/EnumerableExtensions.cs
index d7be50a..a2eebf4 100644
--- a/PowerKit/Extensions/EnumerableExtensions.cs
+++ b/PowerKit/Extensions/EnumerableExtensions.cs
@@ -104,10 +104,12 @@ public IEnumerable<string> WhereNotNullOrWhiteSpace()
         /// </summary>
         public T? LastOrNull()
         {
+#if NET40_OR_GREATER || NETSTANDARD || NET
             if (source is IReadOnlyList<T> list)
             {
                 return list.Count > 0 ? list[list.Count - 1] : null;
             }
+#endif
 
             var last = default(T?);
 
@@ -124,7 +126,11 @@ public IEnumerable<string> WhereNotNullOrWhiteSpace()
         /// </summary>
         public T? ElementAtOrNull(int index)
         {
+#if NET40_OR_GREATER || NETSTANDARD || NET
             var list = source as IReadOnlyList<T> ?? source.ToArray();
+#else
+            var list = source as IList<T> ?? source.ToArray();
+#endif
             return index >= 0 && index < list.Count ? list[index] : null;
         }
     }
diff --git a/PowerKit/Extensions/ExceptionExtensions.cs b/PowerKit/Extensions/ExceptionExtensions.cs
index 08cd54c..534ac8a 100644
--- a/PowerKit/Extensions/ExceptionExtensions.cs
+++ b/PowerKit/Extensions/ExceptionExtensions.cs
@@ -11,7 +11,11 @@ internal static class ExceptionExtensions
         /// Returns a flat list containing the exception itself and all of its
         /// nested inner exceptions, recursively unwrapping <see cref="AggregateException" /> instances.
         /// </summary>
+#if NET40_OR_GREATER || NETSTANDARD || NET
         public IReadOnlyList<Exception> GetSelfAndDescendants()
+#else
+        public IList<Exception> GetSelfAndDescendants()
+#endif
         {
             static void PopulateDescendants(Exception ex, ICollection<Exception> result)
             {
@@ -36,3 +40,4 @@ static void PopulateDescendants(Exception ex, ICollection<Exception> result)
         }
     }
 }
+
diff --git a/PowerKit/Extensions/FileExtensions.cs b/PowerKit/Extensions/FileExtensions.cs
index 402104c..e26f970 100644
--- a/PowerKit/Extensions/FileExtensions.cs
+++ b/PowerKit/Extensions/FileExtensions.cs
@@ -121,6 +121,7 @@ public static byte[] ReadAllBytes(string path, long offset, int length)
             return buffer;
         }
 
+#if NET40_OR_GREATER || NETSTANDARD || NET
         /// <summary>
         /// Reads all bytes from the specified file starting at the given offset asynchronously.
         /// </summary>
@@ -183,5 +184,6 @@ public static async Task<byte[]> ReadAllBytesAsync(
 
             return buffer;
         }
+#endif
     }
 }
diff --git a/PowerKit/Extensions/StreamExtensions.cs b/PowerKit/Extensions/StreamExtensions.cs
index cb865a1..8efe130 100644
--- a/PowerKit/Extensions/StreamExtensions.cs
+++ b/PowerKit/Extensions/StreamExtensions.cs
@@ -10,6 +10,7 @@ internal static class StreamExtensions
 {
     extension(Stream source)
     {
+#if NET40_OR_GREATER || NETSTANDARD || NET
         /// <summary>
         /// Copies the contents of the stream to the destination stream, optionally flushing after each write.
         /// </summary>
@@ -97,5 +98,6 @@ await source
                 .CopyToAsync(destination, contentLength, progress, cancellationToken)
                 .ConfigureAwait(false);
         }
+#endif
     }
 }
diff --git a/PowerKit/Extensions/TextReaderExtensions.cs b/PowerKit/Extensions/TextReaderExtensions.cs
index 72acb84..1f48311 100644
--- a/PowerKit/Extensions/TextReaderExtensions.cs
+++ b/PowerKit/Extensions/TextReaderExtensions.cs
@@ -9,6 +9,7 @@ internal static class TextReaderExtensions
 {
     extension(TextReader reader)
     {
+#if NET40_OR_GREATER || NETSTANDARD || NET
         /// <summary>
         /// Reads all lines from the text reader as an async sequence.
         /// </summary>
@@ -23,5 +24,6 @@ await reader.ReadLineAsync(cancellationToken).ConfigureAwait(false) is { } line
                 yield return line;
             }
         }
+#endif
     }
 }
diff --git a/PowerKit/PowerKit.csproj b/PowerKit/PowerKit.csproj
index 4c39f87..39e4e7c 100644
--- a/PowerKit/PowerKit.csproj
+++ b/PowerKit/PowerKit.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFrameworks>netstandard2.0;net35;net10.0</TargetFrameworks>
     <IsPackable>true</IsPackable>
   </PropertyGroup>