Look at Preferences > Editor > File Types in the Text files section, probably the name of your file, delete it.

If you cannot find it there, the next option is to search for IntelliJ caches for the file name, for example, find . -name "*.xml" | xargs grep "Whoopsies" find . -name "*.xml" | xargs grep "Whoopsies" find . -name "*.xml" | xargs grep "Whoopsies" . IntelliJ must remember this value somehow ...
The cache location depends on your operating system and version of IntelliJ ( source ).
Window
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]
kuporific Jan 24 '14 at 18:32 2014-01-24 18:32
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