Wrong file association for one file in IntelliJ / Android Studio

Look in the Preferences > Editor > File Types under Text files, the name of your file is probably there, remove it.

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If you cannot find it there, the next option is to search IntelliJ's caches for the name of the file, e.g., find . -name "*.xml" | xargs grep "Whoopsies". IntelliJ has to be remembering that value somehow...

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The cache locations depends on your operating system and IntelliJ version (source).

Windows

Windows Vista, 7, 8:

\Users\[USER ACCOUNT NAME]\.[PRODUCT][VERSION]

Windows XP:

[SYSTEM DRIVE]\Documents and Settings\[USER ACCOUNT NAME]\.[PRODUCT][VERSION]

*nix

~/.[PRODUCT][VERSION]

Mac OS X

Configuration:

~/Library/Preferences/[PRODUCT][VERSION]

Caches:

~/Library/Caches/[PRODUCT][VERSION]

Plugins:

~/Library/Application Support/[PRODUCT][VERSION]

Logs:

~/Library/Logs/[PRODUCT][VERSION]

I got the same sort of problem. I found my file in the following File Type: