epi is: Epi extension is related to EclipsePackager Invoice. You can try to open epi files with Eclipse Packager software.
Epi extension stands for compressed files. These file formats are used with Eclipse Packager software. It is a multipurpose compression and opener software. It can archive and divide the files for the purpose of keeping in mobile devices and disks.
To get detailed information about the software, please check the following web page.
Epi File format viewers or openers
Epi File related links.