ArtRage painting tool supports export to all kind of graphics formats, including PSD format from Adobe Photoshop as well some other common formats like JPEG. Considering .ptg projects can only be opened and worked upon in ArtRage, the default program remains the only option for this conversion.
Convert ArtRage project to Adobe Photoshop graphics file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert ptg to psd on Windows
A stylish painting package
Convert from ptg file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.