Heyo,
Attention Mods/Admins : Recently, the Wikia has been experiencing problems with ". exe". Cleric himself said that simply typing ". exe" trips the spam filter when a user edits/creates a page. This is one of the reasons you might have been seeing pages switched to ". exe", so no need to scratch your heads at that anymore.
If you have a pasta that you cannot add to the Article Listing because of the spam filter, alert a Mod/Admin for a notice to put on your talk page. The entire problem should be fixed eventually. In the meantime, it's best to check the Talk Pages before blocking a user.
I just think it was very important for everyone to know this, as this is becoming a really big problem for people. So, you aren't alone if you've had these problems too.