EXE are the programs that are used to open the files. PCT.exe is the more popular one. Download PCT-Open.com. PCT-Open has a list of commonly used programs for downloading the file extension. How Do I Open PCT Files Using Windows? [UPDATE] — Open Image Viewer As a side note, this tutorial has been updated, and it's working on Windows 8 and Windows 10 (Vista does not work at all anymore). How to open .PCT files using Windows 10 — Image Viewer 1. Open the image file you want to open. 2. The Program, click on View 3. Click on Image 4. Use the arrow to click or use the “click to select” when available to select the right image. (When on the image you would like to edit, you can click to select from any of the image that are already displayed (right click, right click, or right click select, etc.)) 5. Click on Preview when previewing. 6.