Adobe Photoshop family of photo editors is the software you need in order to export or convert .psdx to some common graphics format, including TIFF format (.tif, .tiff). As far as we know, this seems to be only way how to achieve psdx to tiff conversion.
Convert Adobe Photoshop Touch graphics to Aldus Tagged Image File Format (TIFF) bitmap image.
We found 2 software records in the database related to .psdx to .tiff file format conversion.
Microsoft Windows software - convert psdx to tiff on Windows
One of the best bitmap graphic editing program
Convert from psdx file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned psdx to tiff. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert psdx to tiff on OS X
Mac version of popular digital image editor