.EFSLIB File

The EFSLIB file extension is associated with the eSignal online trading software and used for files that contains EFS function library data.

How to open:

Generally speaking, program specific accounting files can only be used in their respective programs. However, you can often export to some exchange format that should be widely supported .For general information try to look at:Basic info how to open accounting and tax files

How to convert:

Most of financial and accounting file types can be exported to OFX or QFX format, or even CSV (Comma Separated Value) format. For general information try to look at:Basic info how to convert accounting and tax files