Why can desktop search find a file by name but not by words inside it?

Start with two separate questions: is the folder included in the search index, and is that file type set up for searching inside its contents? In Windows, a file can be found by name even when search is configured to look at properties only, rather than properties and content. [S1]

First, note the file's folder and extension—for example, a hypothetical file in Documents ending in .docx. Then check whether that folder is an indexed location and whether that extension is configured to include content. Avoid changing several settings at once; checking one at a time makes it easier to tell which issue mattered.

For Windows, check the Searching Windows settings. If you use Classic search, look for Customize search locations and then Modify to review the selected locations. Microsoft’s guidance identifies whether the correct folder is selected as a key check. [S1] [S2]

Compare the selected locations with the actual folder containing the file. Don't assume that searching a similarly named folder means the file's own location is included. If the folder wasn't selected and you choose to include it, give indexing time to catch up before judging the result.

Yes. Check how Windows handles the file extension. In Indexing Options, open Advanced and then File Types; inspect the relevant extension and whether it is set to search properties and content rather than properties only. [S1] [S2]

For example, suppose a hypothetical file is meeting-notes.docx in an indexed folder. Finding meeting-notes but not a distinctive phrase from inside it would make the .docx file-type setting worth checking. That is an example of how to narrow the search, not proof that this setting is the cause. The cited Windows guidance describes these checks but does not establish that every format or file will have searchable text.

If the folder or many files were recently added or changed, wait for indexing to progress and try again later. Windows results can be incomplete during indexing; Microsoft notes that processing changed files can take hours, depending on how many files changed. [S1] [S2]

For a simple comparison, pick one file in the folder, search for its name, and separately try a distinctive phrase you can see in its contents. Repeat the same two searches after waiting. Record what you searched and when, so you can distinguish a temporary delay from a repeatable name-only result. This comparison is a practical test, not a guarantee that indexing is finished.

Use this sequence:

1. Write down the file's folder and extension.
2. Confirm that the folder is among the indexed locations.
3. Check the extension under Advanced > File Types and note whether it includes content.
4. If you changed locations or many files recently, allow time for indexing.
5. Retest the filename and an exact, distinctive phrase from the same file.

The example paths and filenames above are placeholders. These instructions are for Windows based on the cited Microsoft guidance; it does not establish equivalent menu steps for other desktop systems. If both checks appear correct and the phrase still is not found, the available guidance doesn't identify the cause, so note your settings and seek guidance specific to your Windows setup.