# "\[ProjectName\]-4603.dll  is either not designed to run on Windows or contains an error.

**URL:** <https://forums.unrealengine.com/t/projectname-4603-dll-is-either-not-designed-to-run-on-windows-or-contains-an-error/437380>\
**Category:** Community & Industry Discussion\
**Tags:** error, dll, unreal-engine, question\
**Created:** [November 10, 2018, 12:48pm UTC](https://forums.unrealengine.com/t/projectname-4603-dll-is-either-not-designed-to-run-on-windows-or-contains-an-error/437380 "2018-11-10T12:48:21Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![anonymous\_user\_193ab718](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_193ab718](https://forums.unrealengine.com/u/anonymous_user_193ab718)\
**Post date:** [November 10, 2018, 12:48pm UTC](https://forums.unrealengine.com/t/projectname-4603-dll-is-either-not-designed-to-run-on-windows-or-contains-an-error/437380/1 "2018-11-10T12:48:21Z")

</div>

Hi, I started working on a project last night and when I tried to open it this morning I got a dll error stating  
“[ProjectPath]/[ProjectName]-4603.dll is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vendor for support. Error status 0xc000012f”

I’ve tried verifying the engine and it hasn’t made a difference. What should I do?

---

<div class="post-metadata">

**Author:** ![ElonCamelMusk](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@ElonCamelMusk](https://forums.unrealengine.com/u/ElonCamelMusk)\
**Post date:** [May 13, 2019, 2:09am UTC](https://forums.unrealengine.com/t/projectname-4603-dll-is-either-not-designed-to-run-on-windows-or-contains-an-error/437380/2 "2019-05-13T02:09:19Z")

</div>

This is a bit late but I hope it helps.

Try Deleting your Intermediate and binaries folders, in the main folder and for each plugin,

Then recompile the Project, by right clicking the UProject file and choose Generate Visual Studio Project Files

It should work. I got a similar error and that fixed it.

---

<div class="post-metadata">

**Author:** ![chxndlerpc](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@chxndlerpc](https://forums.unrealengine.com/u/chxndlerpc)\
**Post date:** [October 16, 2021, 7:04pm UTC](https://forums.unrealengine.com/t/projectname-4603-dll-is-either-not-designed-to-run-on-windows-or-contains-an-error/437380/3 "2021-10-16T19:04:19Z")

</div>

This works 😃