Can't search by dollar amounts that are in filename

I have a bunch of PDF documents in a network folder that follow a similar file name structure:

CompanyName - $160.99.pdf

When I open the folder containing all the documents in Windows 7, I can search by the CompanyName, but not by the dollar amount. The search just simply shows no results when searching by dollar amount. It shows perfect results when I search by company name.

I've tried searching both with and without the dollar ($) sign, but no change. As in the above example, I would get nothing if I searched for 160.99 or $160.99.

I've searched high and low but I've found nothing similar or people with the same problem.

Any idea what would cause this behavior?

My suggestion to use asterisks around the term, like *160.99*, worked for the poster, and below is my reasoning.

The blog Character based versus word based search, or Searching with wildcards on Windows Vista says:

On Windows XP search is character based. That is, if you search for a string 'test', it will find files named 'my test data.doc', 'additional testing.xls' as well as 'latest junk.txt' or (if you tell it to search also contents of files) files containing words such as 'test', 'tester' and 'fattest'.

On Windows Vista, and on Windows XP with WDS installed, search is normally word based. Searching for the string 'test' will only find documents with the word 'test' in them, or words beginning with 'test'. So it will find the files named 'my test data.doc' and 'additional testing.xls' but it will not find 'latest junk.txt'. Moreover, it will find documents containing 'test' or 'tester' but it will not find documents containing 'fattest'.

The main reason for the change is that by making search word based one can use an index to make searches much faster.

My reasoning was that because of the point in the filename, the Windows algorithm for extracting words has failed. The asterisks were added as an attempt to force a search that is more character-based, which did work.

That said, I do counsel against using Windows Search, by reason of its simply being too flaky and just too weird. Disabling it is one of the first changes that I do with a new computer.

Here are two products that are much better at searching filenames:

Everything Search Engine: Uses an index and is lightning-fast.
FileLocator Lite: Does not use an index, so starts faster but searches slower.

I consider the Everything Search Engine as one of my most useful utilities, and set it up to start with Windows so it will always be up to date.

You need to wrap your search in the following way:

~="searchterm"

So, for example, if I search 160.99 or $160.99 I get no results, but if I search ~="160.99" or ~="$160.99" I match the file.

Source

As to why this symbol ($) is special, I presume it is because it is a special character in .NET regular expression matching.