If I set the platform to windows (default when adding the game) there are no warnings in the console.
When I set the platform to DOS, I get this:
The game in 'C:\Games\Sierra\Slater and Charlie Go Camping\' seems to be unknown.
Please, report the following data to the ScummVM team along with name of the game you tried to add and its version/language/etc.:
"resource.000", "1846b57fe84774be72f7c50ab3c90df0", 2256126
"resource.map", "21f85414124dc23e54544a5536dc35cd", 4044
"resource.msg", "c44f51fb955eae266fecf360ebcd5ad2", 1132
The checksum should be identical for both windows and dos versions.
This happened to me in other games as well (but usually the opposite way: dos was recognized, and windows was not).
Could you post a full file listing?
Normally all of those games should get detected as DOS.
This game was even listed as being a demo. Fixed that in r51981.
If there is nothing really changed in the "windows" interpreter version, we won't detect it as being "windows" as well.