---
title: "Why does my .NET app run differently on Windows versus Linux?"  
description: "Why does my .NET app run differently on Windows versus Linux?"  
author: "Austin Luthar"  
published: 2026-09-21  
canonical: https://answers.mindstick.com/qa/117256/why-does-my-net-app-run-differently-on-windows-versus-linux  
category: "Cross-Platform Development"  
tags: ["linux", "windows", "portability"]  
reading_time: 1 minute  

---

# Why does my .NET app run differently on Windows versus Linux?

## OS-Specific Behavior

A file path works on your Windows workstation but throws a PathTooLongException on a Linux server. The two operating systems handle case sensitivity, line endings, and path separators differently, and .NET does not magically erase those gaps.

### Normalizing paths properly

Stop concatenating strings with backslashes. Use `Path.Combine` and `Path.DirectorySeparatorChar`, or better yet, switch to `Path.GetFullPath` early in the workflow. This removes the guesswork.

- Test file operations against both OS targets in your CI pipeline.
- Do not store user-uploaded files under the application root on Linux; use absolute paths.
- Watch out for hidden characters in filenames when moving between platforms.


---

Original Source: https://answers.mindstick.com/qa/117256/why-does-my-net-app-run-differently-on-windows-versus-linux

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