Notes about the XAC file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The XAC file type is primarily associated with 'GNUCash' by The GNUCash Project. GnuCash creates several types of files to help ensure that your data is not lost. You may see files with the following file extensions: xac, log, LCK, LNK in the same directory as your primary data file. Each time you save your data file, a backup copy will also be saved with the extension xac. This backup file is a complete copy of your previous data file, and the filename format refers to the data file, year, month, day and time of the backup. For example, the filename gcashdata.20060414185747.xac indicates this is a backup copy of the file gcashdata saved in the year 2006, April 14, at 6:57:47 p.m.
To restore an old backup file, simply open the .xac file with the date to which you wish to return. Be sure and save this file under a different name; do not use a .xac extension for a regular data file name.
Detailed information for file extension XAC:
Company: The GNUCash Project
File classification: Database
To change file associations press Windows Key
and then Apps and Features
> Default apps
> Choose default apps by file type
Invalid file associations could be the result of underlying issues within your Windows PC.