Small set of filetype icons for coding.
To associate these with your current compiler/ide you need to edit registry settings.
Search for HKCR/.c [.h, .rc, etc] that links to a new key.
Look for this new key in HKCR/[newkey]. Export this structure for backup. Here should be a subkey [DefaultIcon] with unnamed string value containing a path to your ide/compiler. Change path to your new icons. Restore to default by merging exported reg-entries.
ico & png
256 & 512 pxl
very small softshadows