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Support for any file extension (e.g. .abc)
You can enable the correct mime type by adding this to your web/.htaccess file (in this case, for *.myr files, for example):
AddType application/x-myriad-music .myror for an m4v file:
AddType video/x-m4v .m4v
To obtain information about the file type, go to the following URL, replacing 999 with the required extension:
For example: http://filext.com/file-extension/wmv
Link to this FAQ: