Look for Files containing a certain Word, and if they do, remove them?

[Genjin]

I'm basically trying to do an Installer for additional content to my software, specifically Language Packs. Because of the way my software works I first have to remove old package files of Languages before I can add a new one. Now what I need is for the Installer to "scan" the folder of where the software was installed and find files that start with a specific prefix.

For example if my User wants to install Spanish language it should work like this:
- Scan the folder for other already existing language packages starting with "lang-" prefix
- May find a file, such as "lang-german.pack"
- (If found such a file, silently remove it)
- Install new file "lang-spanish.pack" to folder

But how do I do this exactly?

I apologize if this is a simple question that already has been answered somewhere, but I am unsure what the term is of what I am looking for and am unable to find a solution because of that.

Thank you very much in advance

[MSG]

It's all in the manual: http://nsis.sourceforge.net/Docs/Chapter4.html

Use FindFirst etc, then either use FileRead etc, or use the macros in wordfunc.nsh (Again, see manual: http://nsis.sourceforge.net/Docs/AppendixE.html )

[Genjin]

Thank you MSG, although I ended up solving it another way. I'm now deleting it with a Wildcard ( Delete "$INSTDIR\lang-*.dcp" ) in my Section and then copy the new package file. My installer checks if if and where my product is installed. It seems to work fine

Thank you again