.CTF File Extension

WhereIsIt was an application developed by Robert Galle. It allowed users to catalog and organize their physical and digital media, to make it easy to see what media they owned and where that media was stored.

For digital media, users could record the files' location. For example, if an MP3 file was stored on a removable drive, a user could note that information in their catalog.

You can open a CTF file with WhereIsIt. However, WhereIsIt is discontinued. Thus, if you do not already have access to WhereIsIt, you likely will not be able to open your CTF file.

CTF files can only be applied to a PSP if the device has the custom .PRX CXMB plugin installed. If it does not have the plugin installed, the PSP will not be able to load the theme.

In most cases, AVG AntiVirus and Internet Security automatically use CTF files to retrieve and install program updates (e.g., new virus definitions) from AVG's servers. Users can also manually update AntiVirus and Internet Security, by selecting Check for updates in the programs' Settings menus.

If your program's CTF file is valid, updates will proceed without issue. If, for some reason, your CTF file is invalid, your program will show an error message that reads something like Update Failed - Invalid Update Control CTF File.

How to fix an invalid CTF file

If AVG AntiVirus or Internet Security tells you that your CTF file is invalid, AVG recommends repairing your installation. To do so, follow the instructions listed on this page of AVG's website.

CTF files are not meant to be opened. AVG AntiVirus and Internet Security load and use CTF files during their update processes as needed.

CTF files may be used to transform multiple files with different structures into a consolidated format. This makes it possible to bulk load or migrate many files at once.