The File Extensions Database


.X40 File Extension

  • Developer by: Jeffrey C Johnson (XTree Company)
  • Category: Document Files

What is an .X40 file?

.X40 is XtreeGold DOS help data

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.

How to solve problems with X40 files

  • Associate the X40 file extension with the correct application. On :
    Windows: Right click on any X40 file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.X40 files". Mac: Right click (or Ctrl-click) the X40 file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .X40 is XtreeGold DOS help data. Because only the current version supports the latest X40 file format. Search, therefore, e.g. on the Jeffrey C Johnson (XTree Company) manufacturer website after an available .X40 is XtreeGold DOS help data update.
  • To make sure that your X40 file is not corrupted or virus-infected, get the file again and scan it with antivirus software.