# Unreal engine 4.10 cant open project

**URL:** <https://forums.unrealengine.com/t/unreal-engine-4-10-cant-open-project/366565>\
**Category:** Platform & Builds\
**Tags:** freeze, unreal-engine, crash, bug-report, UE4, question\
**Created:** [August 9, 2016, 2:02am UTC](https://forums.unrealengine.com/t/unreal-engine-4-10-cant-open-project/366565 "2016-08-09T02:02:23Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Sean\_Flint](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Sean\_Flint](https://forums.unrealengine.com/u/Sean_Flint)\
**Post date:** [August 9, 2016, 5:19pm UTC](https://forums.unrealengine.com/t/unreal-engine-4-10-cant-open-project/366565/4 "2016-08-09T17:19:02Z")

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Okay, if there are no .umap files, that means that there was not a backup created. Typically, this sort of message would mean that the map file has become corrupted. Resolving this usually involves either grabbing one of the backup files (which in your case there are none, unfortunately), recreating the affected map, etc. There are some suggestions in this forum post that might help: [Failed to open map file. This is most likely because the map was saved with a newer!! - General Discussion - Unreal Engine Forums](https://forums.unrealengine.com/showthread.php?2567-Failed-to-open-map-file-This-is-most-likely-because-the-map-was-saved-with-a-newer)!!

Otherwise, it just seems like a corrupted map file. The best way to prevent data loss is to look into using Source Control. You can find our documentation on Source Control here:

> **[Using Perforce as Source Control](https://docs.unrealengine.com/4.27/en-US/ProductionPipelines/SourceControl/Perforce/)**
>
> How to setup Perforce so that you can share assets with other on your team.

> **[Using SVN as Source Control](https://docs.unrealengine.com/4.27/en-US/ProductionPipelines/SourceControl/SVN/)**
>
> How to setup SVN so that you can share assets with other on your team.

> **[A new, community-hosted Unreal Engine Wiki](https://forums.unrealengine.com/t/a-new-community-hosted-unreal-engine-wiki/141494)**
>
> After over a year in maintenance mode, the official Unreal Engine Wiki is now permanently offline. These resources now live on a new community-run Unreal Engine Community Wiki — ue4community.wiki! You will be able to find content from the official...

Have a great day!

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