ウィンドウズは、拡張子を付けないとファイルを読んでくれない。

Windows (Microsoft operating system)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

(filename) extension

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to attach; to join; to add; to append; to affix; to stick; to glue; to fasten; to sew on; to apply (ointment); to furnish (a house with); to wear; to put on; to keep a diary; to make an entry; to appraise; to set (a price); to allot; to budget; to assign; to bring alongside; to place (under guard or doctor); to follow; to shadow; to load; to give (courage to); to keep (an eye on); to establish (relations or understanding); to turn on (light)

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

file

to read; to count; to guess; to predict; to read (someone's thoughts); to see (e.g. into someone's heart); to divine