Files that contain the .vem file extension are associated with the Sony Virtual Expander file compression utility. This software tool is included on Sony Micro Vault flash drive devices.
When a file is compressed with the Sony Virtual Expander file compression utility, it is saved in the VirtualExpander_WW folder as a VEM file. When the files are taken out of this folder, they are automatically decompressed and return to the full file size.
The VEM file format was created by Sony to save space on the Micro Vault flash drives. Because the files with the .vem suffix are compressed, they take up less drive space than the uncompressed form of the files.
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