Seeing those flowers, it is probably Epicyclia Mabel Kanda or Epicyclia Serena O'Neill, or a closely related hybrid. These are Encyclia cordigera hybrids with some Epidendrum paniculatum in the ancestry, and some with another Encyclia species as well. That bit of Epidendrum would explain why it has very Encyclia-like flowers but without the typical round pseudobulbs.
You should be able to find culture instructions for either of those hybrids, or Encyclia cordigera would also be a good model. Windowsill growing is certainly possible if you have enough light.
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