Why is makepri.exe creating more than one Resources.pri file? - windows-10

Question

I'm trying to create a Resources.pri file so that Windows 10 knows which images to use for my start tile on different resolutions. I'm following step 6 of MSDN's documentation linked below:
https://msdn.microsoft.com/en-us/library/windows/apps/dn393983.aspx#Specify_images_for_scaling__localization__and_high_contrast
I have all of my logo images labeled according to their scale. These are their names in my Assets folder:
70x70Logo.scale-80.png
70x70Logo.scale-100.png
70x70Logo.scale-140.png
70x70Logo.scale-180.png
150x150Logo.scale-80.png
150x150Logo.scale-100.png
150x150Logo.scale-140.png
150x150Logo.scale-180.png
When I use makepri.exe manually, it creates three Resources.pri files instead of just one with all of the scaling information I want in it. These are the files generated:
Resources.pri
Resources.scale-140.pri
Resources.scale-180.pri
Resources.pri has information for the 80% and 100% scales, but the other two files contain the information for the 140% and 180% scales. Any idea why the larger scales are being separated out into separate files? I've included below my TestAppConfig.xml file and the commands I'm using the generate the files.
TestAppConfig.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<resources targetOsVersion="10.0.0" majorVersion="1">
<packaging>
<autoResourcePackage qualifier="Language"/>
<autoResourcePackage qualifier="Scale"/>
<autoResourcePackage qualifier="DXFeatureLevel"/>
</packaging>
<index root="\" startIndexAt="\">
<default>
<qualifier name="Language" value="en-US"/>
<qualifier name="scale" value="100"/>
</default>
<indexer-config type="folder" foldernameAsQualifier="true" filenameAsQualifier="true" qualifierDelimiter="."/>
<indexer-config type="resw" convertDotsToSlashes="true" initialPath=""/>
<indexer-config type="resjson" initialPath=""/>
<indexer-config type="PRI"/>
</index>
<!--<index startIndexAt="Start Index Here" root="Root Here">-->
<!-- <indexer-config type="resfiles" qualifierDelimiter="."/>-->
<!-- <indexer-config type="priinfo" emitStrings="true" emitPaths="true" emitEmbeddedData="true"/>-->
<!--</index>-->
</resources>
Command to create TestAppConfig.xml
"C:\Program Files (x86)\Windows Kits\10\bin\x86\makepri.exe" createconfig /cf %USERPROFILE%\Documents\TestAppConfig.xml /dq lang-en-US_scale-100_contrast-high /pv 10.0.0
Command to create Resources.pri
"C:\Program Files (x86)\Windows Kits\10\bin\x86\makepri.exe" new /pr %USERPROFILE%\Documents\CreateResources /cf %USERPROFILE%\Documents\TestAppConfig.xml /in TestApp /of %USERPROFILE%\Documents\CreateResources\Resources.pri
Any insight into this is greatly appreciated! Let me know if I can provide and further details.

Answer 1

I ended up finding a solution, though I'm exactly sure why it worked/was required to create just one Resources.pri file. I found that setting the default language of all of the images allowed makepri.exe to add all of the image scales as resouces candidates to one Resources.pri file. For example, I found this file structure worked:
\Assets
\en-US
70x70Logo.scale-80.png
70x70Logo.scale-100.png
70x70Logo.scale-140.png
70x70Logo.scale-180.png
150x150Logo.scale-80.png
150x150Logo.scale-100.png
150x150Logo.scale-140.png
150x150Logo.scale-180.png
I was clued in by this snippet of documentation:
Note We recommend that you mark the default language on string resource files (such as en-US\resources.resw) and the default scale on images (such as logo.scale-100.png), even if these files will not be localized nor multiple resolution images provided
https://msdn.microsoft.com/en-us/library/windows/apps/hh965372.aspx
Go figure.
I hope others find this helpful. If anyone has anymore insight on why makepri.exe works this way, I'd be curious to know more.

Answer 2

I've just encountered this with languages rather than images, but removing this block from the auto-generated makepri config fixed it for me:
<packaging>
<autoResourcePackage qualifier="Language"/>
<autoResourcePackage qualifier="Scale"/>
<autoResourcePackage qualifier="DXFeatureLevel"/>
</packaging>