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What Is a PCT File?
Some applications still use the format, butPDFhas all but replaced it.

The first can store eight colors, while the second and newer format supports thousands of colors.
Some examples includeprojected capacitive touchscreen, program coding tools, private communication technology, andparallel cellular tool.
you’ve got the option to read more about conversions in that section below.

Atext editormight work, too.
You might also have luck using one of the other openers linked above.
Photoshop, for example, can save it toPNG,JPG, and several others.
Another option is to upload the file toOnline-Convert.com.
That website gives you the option to save to formats likeBMPandGIF.
Still Can’t Open It?
Check out that link if your file actually ends in that file extension.
POT andPOTXare similar examples.
These are most likely MS PowerPoint templates, meaning they aren’t at all related to a picture format.
Finally, there are PTC files that are used as a color swatches by PANTONE Color Manager.