When I was working in the OT, I occasionally would take part in discussions with Palestinian officials and businessmen.

Sometimes I would have to ask whether we had an apparent aggreement that was actually disagreement on a proposal or a rejection of it.

The 14th century Franciscan Ramón Llull knew the Guide to the Perplexed in Arabic according to his own writings. It is more likely that he had an Arabic script version, but it is quite possible that he read it in Hebrew characters.

http://www.aiys.org/webdate/tobi.html:

Even those few scholars in Yemen who had some interest in Judaism turned to Jewish scholars when they wanted to learn about Jewish views or to ask them to produce Arabic renditions of Jewish sources. This was the case, possibly unique, of the transcription to Arabic characters of The Guide to the Perplexed, the philosophic work of Maimonides, originally written in Judeo-Arabic. The transcription was done during the 15th century in Yemen, probably by a Jew requested to by a Muslim scholar who, although informed about Maimonides and his famous book, was not able to read a text written in Hebrew characters. It seems that this very manuscript was used by al-Shawkani, the well known Muslim jurist (d. 1834), as may be learnt from his polemical book against the Jews of Sanaa when he refers to the Maimonidean philosophy. His direct appeal to the Jewish San’ani scholars in order to be equipped with the Jewish material derived from the short, but famous, treatise written by them to answer his question pertaining to the issue of material or spiritual reward in the world to come according to Jewish conviction.

“The Commentary’s cause was not helped by it’s having been written in Arabic, but Maimonides had little choice if he was to reach the ordinary man whose ability to understand Hebrew was deficient. Although fluency in the Hebrew language was far from universal, almost everyone could read the letters. By using them to write in Arabic, Jewish authors of the time assured themselves of an orthographic barrier, making it unlikely that Muslims would take the trouble attempt penetration of their text.”

Maiaimonides, Sherwin B. Nuland 2005 Schocken Books

There is no reason to believe the Arabic-script Arabic text of Guide to the Perplexed was unavailable from the beginning of its circulation in the 12th century.

Maimonides himself was certainly literate in Arabic script and had no problem with studying Arabic philosophy.

His family respected Islam — especially his grandson Obadyah (Abdallah), whose synagogue followed the form and style of a Mosque.

Copy of the original:
http://www.teachittome.com/seforim2/seforim/moreh_nevuchim_arabic.pdf