I do not know where I originally got the below but it works just fine on my Win98FE machine.
This hack will also increase the icon cache size - but this time it is selectable from the Explorer > View > Folder Options > View tab where you will be offered 4 choices: 1024, 2048, 4096 and 8192.
________copy below___________________
REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\explorer\Advanced\IconCache]
"Text"="Icon Cache Size"
"Type"="group"
"Bitmap"="SHDOC401.DLL,6"
"HelpID"="update.hlp#51140"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\explorer\Advanced\IconCache\Small]
"RegPath"="Software\\Microsoft\\Windows\\CurrentVersion\\Explorer"
"Text"="1024 Icons"
"Type"="radio"
"CheckedValue"="1024"
"ValueName"="Max Cached Icons"
"DefaultValue"="2048"
"HKeyRoot"=dword:80000002
"HelpID"="update.hlp#51140"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\explorer\Advanced\IconCache\Medium]
"RegPath"="Software\\Microsoft\\Windows\\CurrentVersion\\Explorer"
"Text"="2048 Icons"
"Type"="radio"
"CheckedValue"="2048"
"ValueName"="Max Cached Icons"
"DefaultValue"="2048"
"HKeyRoot"=dword:80000002
"HelpID"="update.hlp#51140"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\explorer\Advanced\IconCache\Large]
"RegPath"="Software\\Microsoft\\Windows\\CurrentVersion\\Explorer"
"Text"="4096 Icons"
"Type"="radio"
"CheckedValue"="4096"
"ValueName"="Max Cached Icons"
"DefaultValue"="2048"
"HKeyRoot"=dword:80000002
"HelpID"="update.hlp#51140"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\explorer\Advanced\IconCache\Huge]
"RegPath"="Software\\Microsoft\\Windows\\CurrentVersion\\Explorer"
"Text"="8192 Icons"
"Type"="radio"
"CheckedValue"="8192"
"ValueName"="Max Cached Icons"
"DefaultValue"="2048"
"HKeyRoot"=dword:80000002
"HelpID"="update.hlp#51140"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\explorer]
"Max Cached Icons"="2048"
------Copy above this line----------
Paste it into NotePad and save the file as "MaxCachedIcon.reg" with the quotation marks and to your desktop (for ease).
Then right click on it and select "Merge".
Choose Yes it is Okay to merge it into the registry.
Bryan