The extension PCT denotes a Macintosh PICT images file. These files are also known as QuickDraw files.
This format was developed on the Apple Macintosh and was used to record sequences of QuickDraw commands.
PCT files may include vector graphics or bitmap images. Thanks to the standard nature of PICT files as part of Quicktime, almost any graphics program on the Macintosh can open those files. There, however, usually the ending pict is used.
There are two variants of a format. The older Pict 1 could only store 8 bit graphics, while Pict 2 also has 24 or 32 bit color depth.
The PICT format has now largely been replaced by the more flexible PDF.
Most often resolving problems with opening PCT files is very simple. Just install an appropriate program that supports such files. All of the listed programs support PCT files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of PCT files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate PCT files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the Apple Preview applications is not on the list, select "Browse" option in order to manually locate the directory where Apple Preview has been installed.
Sometimes problems with opening PCT files may not lie with the application itself, but can arise due to other causes, such as: