.ACE File

File extension ace is primarily known to be used for the native format of older  WinACE archiver. Was used somewhat in the past, but didn't gain any significant market share.

MIME types:
application/x-compressed
application/x-ace

This ace 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.

Files with ace extension are in most cases archives compressed using the WinAce utility. Somewhat rare nowadays, but very popular in the past.

How to open:

Use WinACE or another archiving or compression application to open the .ace file.

How to convert:

The easiest way how to convert ACE archive is to decompress it with the use of WinACE and repack the content with another compression or archive application of your choice.