# Unknown extension 'Umap'

**URL:** <https://forums.unrealengine.com/t/unknown-extension-umap/481066>\
**Category:** Pipeline & Plugins\
**Tags:** umap, unreal-engine, question\
**Created:** [March 29, 2021, 6:58pm UTC](https://forums.unrealengine.com/t/unknown-extension-umap/481066 "2021-03-29T18:58:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![78rye](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@78rye](https://forums.unrealengine.com/u/78rye)\
**Post date:** [March 29, 2021, 6:58pm UTC](https://forums.unrealengine.com/t/unknown-extension-umap/481066/1 "2021-03-29T18:58:19Z")

</div>

Umap will not open.

I have seen other posts about this but why is there never a clear answer? I was working on my project this morning. saved it, came back an hour later and now it won’t open my project. When I go to the content browser, my Umap is not there but the build data is. Then when I try to transfer the .umap autosaves I have, it is doesn’t show up when I try to add/import it and when I drag it into the content browser it just says

“unknown extension .umap”

This the second time I have posted something like this and never heard a response back, but now its for a school project so please can anyone help me?? I can’t lose this project.