What Is a PTX File?
Some PTX files are Pro Tools session files used to reference audio files.
If the file isn’t in that format, it might instead be an electronic transcript file.

PaintShop Pro uses thisfile extension, too, for images that are used as textures for objects and shapes.
PTX can mean other things that are unrelated to these file formats, likepush to transferandperformance toolbox.
E-transcript files can be opened withE-Transcript Manageror for free, in read-only mode, withE-Transcript Viewer.
Since they’re probablytext files, you might also find afree text editoruseful in reading the PTX file.
The similar .PTZ e-transcript bundle files can be opened with these programs as well.
If a PTX file is a Paint Shop Pro texture file,Corel PaintShopcan be used to open it.
PopCap Games files are images used as textures within a video game.
You canread more at ErnestoAM Wiki about tools that should be able to open this kind of file.
This can be done through theFile>Save Session Copymenu.
This means you could’t directly convert PTX toMP3or any other audio format.
The free version of NCH Software’sPixillionimage converter should be able to convert Pentax RAW images.
Some of those programs let you save a TGA file, for example, to something else like JPG.
Still Can’t Open It?
If so, you’ll need a different program to open it.