Unreal Editor Asset Export File
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What is a UEXP file?
A developer creating a video game with Unreal Editor can cook assets they're using in the game, which strips out some pre-processing data. When a developer does this, the asset is transformed from a single UASSET file into a set of three files: a UASSET file, a UEXP file, and a UBULK file. These files are often saved in a PAK archive.
The UEXP file contains the data used to load and show the asset in-game. The UASSET file contains the asset's file header, and the UBULK file contains the asset's bulk data.
How to open a UEXP file
UEXP files are not meant to be opened. To use the asset a UEXP file is associated with, move all of that asset's files, including its UASSET and UBULK files, into your content folder. The asset will then appear in the Unreal Editor Content Browser.