PostScript (.pfm .pfa .afm) is an outline font format originally developed by Adobe Systems.

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TPTQ Arabic fonts are Unicode compliant, so you need to enter your text correctly encoded. An easy way to find out if you have correctly encoded text is to copy-paste a sample of the text into Internet browser, for example into Google search.
Some old text documents working with Arabic or Indic languages use 8-bit encoding, which required to use proprietary fonts. Such fonts can only use 256 glyphs, which is not sufficient for correct rendering of Devanagari (or other 10 Indic writing scripts).
OpenType is a computer font format that was built on its predecessor TrueType, intended to supersede both the TrueType and the PostScript Type 1 font formats.
At TPTQ Arabic you can upgrade previously licensed fonts in other formats to OpenType. We will deduct the price of the fonts you have already paid for. For example, if you upgrade the PostScript version of Fedra Sans Book (for which you paid €60) to Fedra Sans Std Book...
For technical reasons, PostScript fonts can’t be used to create web-embeddable fonts, so if you licensed PostScript versions of our fonts, you will first need to upgrade to OpenType versions.

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Unpacking and installing fonts on Mac OS and Windows