Possible software with support for converting of xap files to appx file format.
APPX packages are apps for Windows Phone 8.1 and later, whilst XAP packages were used up until Windows Phone 8.
There doesn't appear to exist easy way how one could be converted to another (in this case XAP to APPX), that's something the developer of the app could do if he would release two versions for both Windows Phone 8 and 8.1.
Updated: September 27, 2016
Unfortunately, there is no detailed software record in the database for this conversion.
This conversion entry was verified by us and conversion from xap to appx was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it can't be done because incompatibility between programs, caused by closed file formats, very limited support or by other problems.
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