Hello there :)

Today I've tested (on my home computer, running Windows 11 v23H2) adding buttons using the shortcut drag and drop feature, and I've encountered a few issues, some of which seem to be related to the handling of lower/uppercase.

1 - when adding a single button, if the ".exe" part of the icon's name happens to not be entirely in lowercase, then in the main window, the button's icon and caption do not appear.
The button itself can still be highlighted when placing the mouse cursor at its position, the tooltip shows up and the associated program can still be launched.
Changing the button's properties to have the ".exe" in the icon's name be in lower case fixes that issue

2 - when dragging several shortcuts to the main window in order to create the corresponding buttons.
If a single one of those shortcuts has the ".EXE" part of target program's filename written uppercase, then CRAP will open the "Adding New Button" dialogue for each shortcut, until the user confirms the "Add" button for that one shortcut with the uppercase ".EXE", at which point CRAP will basically abort processing the queue: there will be no further window to add the next shortcuts even if more were selected, and the buttons for which the settings were already input will not be added to the layout.

3 - This one isn't related to uppercase vs lowercase file names, but to how some games themselves behave.
A normal Windows shortcut has a "start in" field, which, from my understanding, basically sets the "current folder" before starting the program. This field doesn't appear to exist for CRAP buttons, and so for some programs that need it to be set, they may either fail to run, or try to look for and/or write some files in the wrong place.

I guess it would be logical to do so indeed.