.X40 File

The x40 file extension is associated with XTreeGold, a file manager for MS-DOS operating system, very popular in 1990's, developed by XTree Company.

The x40 file stores help data for XTreeGold.

This x40 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

How to open:

Probably not meant to be accessed by the user.

How to convert:

There is probably no real way how you can convert this particular file type to anything else.