A QUID file is a text document created by Scratchware QuidProQuo, a simple word processor for Windows. It contains text that may be formatted in several different styles, such as bold type, italics, page color, and different fonts and font sizes. QUID files are similar to .RTF files.
You will most likely only encounter QUID files if you create text documents with the QuidProQuo word processor or if someone who uses QuidProQuo shares a document with you via email or cloud storage service. QUID files may be used to save various types of documents, such as reports, letters, essays, and resumes.
QUID files are typically opened with QuidProQuo, but you can also open them with any text editor or word processor that supports formatted text. Some alternatives to QuidProQuo include Microsoft WordPad, Microsoft Word, AbiSource AbiWord, Apple TextEdit, and Apple Pages.