Convert to PCT Online Tool.
There are two types of PCT files. The first is a Mac image saved in the PICT format, which uses Apple QuickDra technology. The image data is either PICT1 (stores eight colors) or PICT2 (stores thousands of colors). This technology originated in 1984, so you rarely see files with a .PICT extension anymore. However, if you do, it can be opened with Adobe Photoshop, Apple Preview (Mac), or XnViewMP (Windows). The second type of PCT file is a chemical data file. The ChemSep application produces this PCT file containing component data. Only ChemSep, a free Windows app can open this type of PCT file.