The default path is actually shown as part of the text to the left. There is no need to enter the path if the default is correct. If no entry is made then the displayed default is used. Note also that the leading ? in th Config.xml path is automatically converted into the system drive letter when forming the default value as displayed is the text to the left.
I hope this answers your concerns.
In CONFIG.XML
the default path for IrfanView and for Inkscape is not displayed:
…….
<IrfanViewPath T="Path to IrfanView program used to create picture thumbnails (Default {0})" Default="?:\Program Files\IrfanView\i_view32.exe" Type="file"/>
……
<InkscapePath T="Path to Inkscape program used to convert SVG to PDF (Default {0})" Default="?:\Program Files\Inkscape\inkscape.exe" Type="file"/>
The default path is not displayed and should rewrite even if it is right!
??? Type="file" ???
otherwise you must set the parameters and rewrite the path for each serving.