You need to go into Tools -> Options -> My Files, Unsafe Categories & change options.
You might also need to add certain extensions to share.
If you need to check Extensions to be shared, Tools -> Options -> Advanced -> Files, then click on File Extensions ... Manage button, then click on type of file. Check & uncheck file extensions you wish to share. Only select those you wish to share & those you know what they are. If unsure, uncheck them for sharing! You do need to be sure you know what you are sharing for your own security! Double-check in P2P Network window file type sections to be sure only desired files are being shared! (Example shown below is Documents.)
Search filters:
Also with LW 5.3 or higher, check this location to be sure: Tools -> Options -> Search (check to make sure Programs is checked. Also check the extensions you are seeking are
not on the search filter list. If they are, remove them!):
.