I haven't tested a MistyPE build from Win10 April 2018 update v1803.17134. At the moment I'm not able to make a test build from the source you used. The more recent source I have used is Win10 Fall Creator Update 1709 from Dec. 2017, and it works flawlessly.
I suggest to make a test build using as source any one confirmed. And then if all your Applications are working fine we may say there is a problem using as source Win10 April 2018 update v1803.17134.
As you don't clarify if your Applications are working in previous sources (all applications included in project download do not require this fixes). In case you have missing dependencies for your 32 bits portable aplications, you may edit syswow.USER.ADDED.txt when making a build from 64 bits Windows source, And/or dependencies.USER.ADDED.txt, when making a build from 32 bits Windows source, both files located on MistyPE\Projects\Tools\wimlib.file.lists\
Yes everything is working fine using Win10 v1709 files. I've been using WinPE & MistyPE since WAIK 2.0, now so this is nothing new to me. The issue is definitely something to do with the SysWOW64 script as none of the 32-bit apps are working when building with 64-bit arch.
I also did a file comparison between a MistyPE created v1709 boot.wim and a v1803 boot.wim, and there are definitely a lot of .dll's and SysWOW64 files missing.
It's fine, I'm not really looking for any help on getting it to work, using the v1709 build files works fine for me. Just wanted to give everyone a heads up. I'm sure Misty will get it updated eventually.
Edited by XenonKilla, A week ago.